Готові списки джерел за темами / Exciton-photon interaction / Статті в журналах
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Статті в журналах з теми "Exciton-photon interaction"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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1

Mareyen, M., F. J. Schütte, and R. Tiebel. "Dynamics of Carrier-Screened Photon-Exciton Interaction." physica status solidi (b) 159, no. 1 (1990): 235–40. http://dx.doi.org/10.1002/pssb.2221590127.

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2

KAIBYSHEV, V. H., and V. V. TRAVNIKOV. "ANOMALOUS ANISOTROPY OF RESONANT RAMAN SCATTERING IN OPEN ZnCdSe/ZnSe NANOWIRES." International Journal of Nanoscience 02, no. 06 (2003): 479–85. http://dx.doi.org/10.1142/s0219581x03001589.

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Анотація:
Anomalous strong linear anisotropy of resonant Raman scattering in open ZnCdSe / ZnSe nanowires has been found. The anisotropy value is more than twice as that due to the anisotropy of exciton–photon interaction which is the characteristic for open nanowires. It is suggested that the anomalous anisotropy is connected with different probability of Frohlich exciton–LO phonon interaction at scattering via transverse and longitudinal exciton states.
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3

Tartakovskii, A. I., V. D. Kulakovskii, Yu I. Koval’, T. B. Borzenko, A. Forchel, and J. P. Reithmaier. "Exciton-photon interaction in low-dimensional semiconductor microcavities." Journal of Experimental and Theoretical Physics 87, no. 4 (1998): 723–30. http://dx.doi.org/10.1134/1.558714.

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4

Tredicucci, Alessandro, Yong Chen, Vittorio Pellegrini, et al. "Controlled Exciton-Photon Interaction in Semiconductor Bulk Microcavities." Physical Review Letters 75, no. 21 (1995): 3906–9. http://dx.doi.org/10.1103/physrevlett.75.3906.

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5

Calvo, Jorge, David Zueco, and Luis Martin-Moreno. "Ultrastrong coupling effects in molecular cavity QED." Nanophotonics 9, no. 2 (2020): 277–81. http://dx.doi.org/10.1515/nanoph-2019-0403.

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Анотація:
AbstractThe spectrum and energy dynamics for a system that comprises a molecule interacting with a cavity photon is analyzed, taking into account the effect of both molecular vibrations and counter-rotating terms (CR) in the dipole Hamiltonian. The CR terms do not have a strong effect on the spectrum even for moderately large values of the exciton-photon interaction. However, it is shown that the polariton subspace is governed by an effective Quantum-Rabi Hamiltonian, where polaritons act as a two-level system and the phonons play the role of cavity photons. The effect of the CR terms is amplified in the dynamics: as the vibrations reduce the effective photon-exciton coupling, small Bloch-Siegert energy shifts can bring the system out of resonance.
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6

Bamba, Motoaki, and Hajime Ishihara. "Breakdown of Fermi's Golden Rule in Exciton–Photon Interaction." Journal of the Physical Society of Japan 78, no. 4 (2009): 043701. http://dx.doi.org/10.1143/jpsj.78.043701.

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7

Li, Bin, Guo-Feng Zhang, Rui-Yun Chen, et al. "Research progress of single quantum-dot spectroscopy and exciton dynamics." Acta Physica Sinica 71, no. 6 (2022): 067802. http://dx.doi.org/10.7498/aps.71.20212050.

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Анотація:
Colloidal semiconductor quantum dots (QDs) have strong light absorption, continuously adjustable narrowband emission, and high photoluminescence quantum yields, thereby making them promising materials for light-emitting diodes, solar cells, detectors, and lasers. Single-QD photoluminescence spectroscopy can remove the ensemble average to reveal the structure information and exciton dynamics of QD materials at a single-particle level. The study of single-QD spectroscopy can provide guidelines for rationally designing the QDs and giving the mechanism basis for QD-based applications. We can also carry out the research of the interaction between light and single QDs on a nanoscale, and prepare QD-based single-photon sources and entangled photon sources. Here, we review the recent research progress of single-QD photoluminescence spectroscopy and exciton dynamics, mainly including photoluminescence blinking dynamics, and exciton and multi-exciton dynamics of single colloidal CdSe-based QDs and perovskite QDs. Finally, we briefly discuss the possible future development trends of single-QD spectroscopy and exciton dynamics.
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8

Jütte, M., H. Stolz, and W. von der Osten. "Coherent exciton–photon interaction and pulse propagation effects of bound exciton states in CdS." physica status solidi (b) 188, no. 1 (1995): 327–34. http://dx.doi.org/10.1002/pssb.2221880130.

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9

Kuroki, Yuichiro, Minoru Osada, Ariyuki Kato, Tomoichiro Okamoto, and Masasuke Takata. "Exciton-Phonon Interaction in CuAlS2 Powders." Advanced Materials Research 11-12 (February 2006): 175–78. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.175.

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Анотація:
High-resolution photoluminescence (PL) measurement was carried out for copper aluminum disulfide (CuAlS2) powder at 12 K. Several sharp PL lines were observed in the range from 3.580 to 3.320 eV. The emission peaks at photon energies from 3.566 to 3.459 eV were attributed to free-exciton (FE) and bound-excitons (BE). The several weak emissions at below 3.476 eV were clarified to be phonon replicas (PR) by Raman scattering and in the viewpoint of exciton-phonon interaction. We observed the one, two and three-phonon replicas related to E(LO, TO) and B2(LO, TO) vibrational modes in chalcopyrite structure. It was suggested that the strong interaction between excitons and optical phonons took place in obtained CuAlS2 powder.
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10

Cao, En, Weihua Lin, Mengtao Sun, Wenjie Liang, and Yuzhi Song. "Exciton-plasmon coupling interactions: from principle to applications." Nanophotonics 7, no. 1 (2018): 145–67. http://dx.doi.org/10.1515/nanoph-2017-0059.

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Анотація:
AbstractThe interaction of exciton-plasmon coupling and the conversion of exciton-plasmon-photon have been widely investigated experimentally and theoretically. In this review, we introduce the exciton-plasmon interaction from basic principle to applications. There are two kinds of exciton-plasmon coupling, which demonstrate different optical properties. The strong exciton-plasmon coupling results in two new mixed states of light and matter separated energetically by a Rabi splitting that exhibits a characteristic anticrossing behavior of the exciton-LSP energy tuning. Compared to strong coupling, such as surface-enhanced Raman scattering, surface plasmon (SP)-enhanced absorption, enhanced fluorescence, or fluorescence quenching, there is no perturbation between wave functions; the interaction here is called the weak coupling. SP resonance (SPR) arises from the collective oscillation induced by the electromagnetic field of light and can be used for investigating the interaction between light and matter beyond the diffraction limit. The study on the interaction between SPR and exaction has drawn wide attention since its discovery not only due to its contribution in deepening and broadening the understanding of SPR but also its contribution to its application in light-emitting diodes, solar cells, low threshold laser, biomedical detection, quantum information processing, and so on.
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11

MIZOUCHI, H. "INITIAL CONDITION SENSITIVITY IN LATTICE RELAXATION AND DOMAIN FORMATION AFTER PHOTOEXCITATION." International Journal of Modern Physics B 15, no. 28n30 (2001): 3869–72. http://dx.doi.org/10.1142/s0217979201008871.

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We theoretically study the lattice relaxation dynamics of a photogenerated exciton resulting in the macroscopic domain. Especially, we concentrate on the "initial condition sensitivity" of the exciton proliferation. This characteristic is as follows. The generation efficiency of the domain depends sensitively on the way of the initial photoexcitation, even if the total photon energy is same. We consider the 1-dimensional many exciton-Einstein phonon system interacting with a reservoir. Within the Markov approximation, the time evolution of the density matrix is investigated full-quantummechanically. Here, we derive the iterative equation for the proliferation and numerically solve it, so that we can treat multi-exciton states in the large system. Depending on the way of the photoexcitation, the initial distance between photogenerated excitions is assumed to take various values. We have shown that the exciton proliferation successfully occurs only when the initial distance is not too short netiher too long. This sensitivity to the initial distance is due to the nonlinear interaction between excitons.
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12

Nji Nde Aboringong, E., I. Ndifon Ngek, and Alain M. Dikandé. "Periodic exciton–polariton solitons in semiconductor nanowires." Modern Physics Letters B 35, no. 18 (2021): 2150307. http://dx.doi.org/10.1142/s0217984921503073.

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Exciton–polariton solitons are nonlinear quasiparticles composed of exciton–photon bound states due to the interaction of light with matter. In semiconductor micro-cavity systems, such as semiconductor micro and nanowires, polaritons are characterized by a negative mass which, combined with the repulsive nonlinear exciton–exciton interaction, leads to the generation of bright polariton solitons. In this work, we investigate the dynamics of bright exciton–polariton solitons in a finite-sized microcavity waveguide, assuming radiative losses to be balanced by the external pumping. Bright-soliton solutions to the model equations of motion, which consist of a periodic train of polariton pulses, are obtained in terms of Jacobi elliptic functions. Analytical expressions of the energies of both photonic and excitonic components of the pulse train are found. Results suggest that the size of a nanowire waveguide plays a relevant role in the quantitative estimate of the energy conveyed by polariton solitons propagating in the medium.
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13

Suhai, S. "Theory of exciton–photon interaction in polymers: Polariton spectra of polydiacetylenes." Journal of Chemical Physics 85, no. 1 (1986): 611–15. http://dx.doi.org/10.1063/1.451586.

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14

Fujita, Hideaki, Hisao Kondo, Hitoshi Nishimura, Takeyuki Okada, Tsutomu Karasawa, and Teruo Komatsu. "Exciton-phonon interaction in the two-photon absorption process in RbI." Journal of Luminescence 51, no. 4 (1992): 167–73. http://dx.doi.org/10.1016/0022-2313(92)90051-a.

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15

Diguna, Lina Jaya, Yudi Darma, and Muhammad Danang Birowosuto. "The coupling of single-photon exciton–biexciton quantum dot and cavity." Journal of Nonlinear Optical Physics & Materials 26, no. 03 (2017): 1750029. http://dx.doi.org/10.1142/s0218863517500291.

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Анотація:
We investigate the influence of multiple excitons on the photon emission properties of a quantum dot (QD)-cavity system via the master equation for the density matrix. We show that in the intermediate to strong coupling regimes, the multiple excitons lead to the suppressed QD emissions as well as the absence of anti-crossing near zero detuning, arising from the interaction between the multiple excitons and cavity. Furthermore, we analyze the role of the cavity-biexciton detuning in the photon emission properties of cavity and exciton through the second-order correlation function. The small cavity-biexciton detuning yields the significant Purcell effect and the high probability of single photon emissions. The proposed model offers the fundamental approach in developing efficient single-photon emitting devices.
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16

Gubin, Mikhail, and Alexei Prokhorov. "Formation of non-classical optical states in spaser systems under control of an external magnetic field." EPJ Web of Conferences 220 (2019): 03017. http://dx.doi.org/10.1051/epjconf/201922003017.

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Анотація:
The work is focused on the investigation of features of quantum dynamics for photons in spaser systems consisting of metal nanoparticles (NP) and semiconductor quantum dots (QDs). The non-classical photon states generation in a three-particle spaser system with nonlinear plasmon-exciton interaction is predicted.
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17

Хаджи, П. И., Л. Ю. Надькин та Д. А. Марков. "Закон дисперсии экситон-поляритонов в условиях действия сильной накачки в области M-полосы люминесценции". Физика твердого тела 60, № 4 (2018): 660. http://dx.doi.org/10.21883/ftt.2018.04.45671.224.

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AbstractThe double-pulse interaction with excitons and biexcitons in semiconductors is studied theoretically. It is shown that the dispersion law of carrier wave has three branches under the action of a powerful pumping in the region of the M -band of luminescence. Values of parameters at which the dispersion law branches can intersect due to the degeneration of the exciton level energy have been found. The effect of a significant change in the force of coupling between the exciton and photon of a weak pulse with a change in the pumping intensity is predicted.
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18

Kurisu, H., J. Horie, K. Nagoya, S. Yamamoto, and M. Matsuura. "Enhancement of Exciton and Biexciton Luminescence in CuCl QDs on Dielectric Multilayers." International Journal of Modern Physics B 15, no. 28n30 (2001): 3841–44. http://dx.doi.org/10.1142/s0217979201008809.

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We investigated photoluminescence properties of the exciton and the biexciton in CuCl quantum dots embedded in an SiO 2 matrix on (λ/4) TiO 2/(λ/4) SiO 2 dielectric multilayers of the distributed Bragg reflector. The intensities of the free exciton luminescence band and the biexciton luminescence bands are enhanced by factors 2 and 6 times in comparison with those in only CuCl quantum dots embedded in an SiO 2 matrix. The origin of this luminescence behavior is partly reflection effects of the luminescence and excitation laser lights but additional effects need to be considered. One possible candidate is the strong exciton-photon interaction due to the confinement effect of the photons in the active layer with CuCl quantum dots.
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19

Narayan, Monishka Rita, and Jai Singh. "Exciton dissociation and design optimization in P3HT:PCBM bulk-heterojunction organic solar cell." Canadian Journal of Physics 92, no. 7/8 (2014): 853–56. http://dx.doi.org/10.1139/cjp-2013-0523.

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Анотація:
The rate of Frenkel exciton dissociation in P3HT:PCBM bulk-heterojunction organic solar cell was calculated using the newly derived interaction operator between charge transfer exciton and molecular vibrational energy. The PCBM LUMO energy levels were tuned to investigate their impact on the rate of dissociation of a Frenkel exciton into free pair of electron and hole. In the latter part of the study, the PCBM LUMO energy level was set to −4.10 eV and design optimization was performed on PET/PEDOT:PSS/TFB/ P3HT:PCBM/Ca bulk-heterojunction organic solar cell using the semiconducting thin film optics simulation software. Each of the layer thicknesses were optimized for maximum photon absorbance in the P3HT:PCBM active layer and a high power conversion efficiency of 7.46% was obtained.
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20

Sodagar, Majid, Milad Khoshnegar, Amin Eftekharian, and Sina Khorasani. "Exciton–photon interaction in a quantum dot embedded in a photonic microcavity." Journal of Physics B: Atomic, Molecular and Optical Physics 42, no. 8 (2009): 085402. http://dx.doi.org/10.1088/0953-4075/42/8/085402.

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21

Tredicucci, Alessandro. "Bulk semiconductors and porous silicon: controlled exciton–photon interaction in active microcavities." Physica Scripta T66 (January 1, 1996): 126–29. http://dx.doi.org/10.1088/0031-8949/1996/t66/020.

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22

Chahshouri, Fatemeh, Masoud Taleb, Florian K. Diekmann, Kai Rossnagel, and Nahid Talebi. "Interaction of excitons with Cherenkov radiation in WSe2 beyond the non-recoil approximation." Journal of Physics D: Applied Physics 55, no. 14 (2022): 145101. http://dx.doi.org/10.1088/1361-6463/ac453a.

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Анотація:
Abstract Cherenkov radiation (CR) from electrons propagating in materials with a high refractive index have applications in particle-detection mechanisms and could be used for high-yield coherent electron beam-driven photon sources. However, the theory of the CR has been treated up to now using the non-recoil approximation, which neglects the effect of electron deceleration in materials. Here, we report on the effect of electron-beam deceleration on the radiated spectrum and exciton-photon interactions in nm-thick WSe2 crystals. The calculation of the CR is performed by simulating the kinetic energy of an electron propagating in a thick sample using the Monto Carlo method combined with the Lienard–Wiechert retarded potential. Using this approach, we numerically investigate the interaction between the excitons and generated photons (CR) beyond the non-recoil approximation and are able to reproduce experimental cathodoluminescence spectra. Our findings pave the way for an accurate design of particle scintillators and detectors, based on the strong-coupling phenomenon.
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23

Klochikin, A. A., B. S. Razbirin, T. Amand, et al. "Influence of the LO-photon-plasmon interaction on the exciton luminescence of insulators." Journal of Physics C: Solid State Physics 19, no. 22 (1986): 4237–46. http://dx.doi.org/10.1088/0022-3719/19/22/011.

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24

Opher-Lipson, M., E. Cohen, and L. N. Pfeiffer. "Spectral line splitting due to exciton-photon interaction in GaAs/AlAs multiple quantum wells." Physical Review B 55, no. 20 (1997): 13778–82. http://dx.doi.org/10.1103/physrevb.55.13778.

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25

VACHA, MARTIN, SHOJI TAKEI, KEN-ICHI HASHIZUME, and TOSHIRO TANI. "LOCAL MORPHOLOGY AND SUB-WAVELENGTH REGION SPECTROSCOPY OF MOLECULAR J-AGGREGATES: ONSET OF EXCITON-POLARITON STATES IN INDIVIDUAL AGGREGATE FIBERS." International Journal of Modern Physics B 15, no. 28n30 (2001): 3993–96. http://dx.doi.org/10.1142/s0217979201009189.

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We present results on reflection microscopy and local spectroscopy of J-aggregates of pseudoisocyanine dyes in a thin film polymer matrix. Local reflectance spectra reveal a wide distribution of optical properties within different locations of one sample. The spectral lineshapes and absolute reflectivities are suggested to originate from varying strength of exciton-photon interaction. Polarization dependence measurements of local reflectivities at different wavelengths provide orientations of the excitonic transition dipole moments with respect to the orientation of the aggregate fibers.
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26

Stolyarchuk, I. D., and O. A. Shporta. "Optical Studies of the Interactions CdS and CdTe Nanoparticles with a Human Serum Albumin." Фізика і хімія твердого тіла 17, no. 4 (2016): 498–503. http://dx.doi.org/10.15330/pcss.17.4.498-503.

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Анотація:
The interaction between CdS , CdTe nanoparticles and human serum albumin (HSA) was studied by absorption and photoluminescence spectroscopy. The performed transmission electron microscopy (TEM) analysis suggests of spherical shape of nanostructures with small size distribution. In the absorption spectra of the colloidal nanoparticles exciton band was found to be shifted to higher photon energy as compared with that for bulk crystals due to the quantum confinement effect. It was shown that addition of HSA to colloidal nanocrystals leds to a gradual decrease of absorption and broadening of exciton structure, resulting in forming nanoparticles–HSA complexes. The photoluminescence quenching results indicated that the quenching effect of nanoparticles CdTe on HSA fluorescence depend on the temperature and the nature of quenching is static. When the concentration of CdS nanoparticles in solution with HSA over 1,5 10-6 mol L-1, in addition to static quenching mechanism of photoluminescence increases of dynamic quenching mechanism.
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27

Dietrich, Christof P., Anja Steude, Laura Tropf, et al. "An exciton-polariton laser based on biologically produced fluorescent protein." Science Advances 2, no. 8 (2016): e1600666. http://dx.doi.org/10.1126/sciadv.1600666.

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Анотація:
Under adequate conditions, cavity polaritons form a macroscopic coherent quantum state, known as polariton condensate. Compared to Wannier-Mott excitons in inorganic semiconductors, the localized Frenkel excitons in organic emitter materials show weaker interaction with each other but stronger coupling to light, which recently enabled the first realization of a polariton condensate at room temperature. However, this required ultrafast optical pumping, which limits the applications of organic polariton condensates. We demonstrate room temperature polariton condensates of cavity polaritons in simple laminated microcavities filled with biologically produced enhanced green fluorescent protein (eGFP). The unique molecular structure of eGFP prevents exciton annihilation even at high excitation densities, thus facilitating polariton condensation under conventional nanosecond pumping. Condensation is clearly evidenced by a distinct threshold, an interaction-induced blueshift of the condensate, long-range coherence, and the presence of a second threshold at higher excitation density that is associated with the onset of photon lasing.
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28

Burdov, Vladimir A., and Mikhail I. Vasilevskiy. "Exciton-Photon Interactions in Semiconductor Nanocrystals: Radiative Transitions, Non-Radiative Processes and Environment Effects." Applied Sciences 11, no. 2 (2021): 497. http://dx.doi.org/10.3390/app11020497.

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In this review, we discuss several fundamental processes taking place in semiconductor nanocrystals (quantum dots (QDs)) when their electron subsystem interacts with electromagnetic (EM) radiation. The physical phenomena of light emission and EM energy transfer from a QD exciton to other electronic systems such as neighbouring nanocrystals and polarisable 3D (semi-infinite dielectric or metal) and 2D (graphene) materials are considered. In particular, emission decay and FRET rates near a plane interface between two dielectrics or a dielectric and a metal are discussed and their dependence upon relevant parameters is demonstrated. The cases of direct (II–VI) and indirect (silicon) band gap semiconductors are compared. We cover the relevant non-radiative mechanisms such as the Auger process, electron capture on dangling bonds and interaction with phonons. Some further effects, such as multiple exciton generation, are also discussed. The emphasis is on explaining the underlying physics and illustrating it with calculated and experimental results in a comprehensive, tutorial manner.
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29

Brotons-Gisbert, Mauro, Juan P. Martínez-Pastor, Guillem C. Ballesteros, Brian D. Gerardot, and Juan F. Sánchez-Royo. "Engineering light emission of two-dimensional materials in both the weak and strong coupling regimes." Nanophotonics 7, no. 1 (2018): 253–67. http://dx.doi.org/10.1515/nanoph-2017-0041.

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Анотація:
AbstractTwo-dimensional (2D) materials have promising applications in optoelectronics, photonics, and quantum technologies. However, their intrinsically low light absorption limits their performance, and potential devices must be accurately engineered for optimal operation. Here, we apply a transfer matrix-based source-term method to optimize light absorption and emission in 2D materials and related devices in weak and strong coupling regimes. The implemented analytical model accurately accounts for experimental results reported for representative 2D materials such as graphene and MoS2. The model has been extended to propose structures to optimize light emission by exciton recombination in MoS2 single layers, light extraction from arbitrarily oriented dipole monolayers, and single-photon emission in 2D materials. Also, it has been successfully applied to retrieve exciton-cavity interaction parameters from MoS2 microcavity experiments. The present model appears as a powerful and versatile tool for the design of new optoelectronic devices based on 2D semiconductors such as quantum light sources and polariton lasers.
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30

Yuan, Xiao-Jie, Ping Dong, Min Wang, Ming Yang, and Zhuo-Liang Cao. "Remote quantum state preparation and transfer with the interactions of photons and quantum-dot spins." Modern Physics Letters B 28, no. 16 (2014): 1450127. http://dx.doi.org/10.1142/s0217984914501279.

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Анотація:
In this paper, we propose a scheme of remote quantum state preparation and transfer that use a double-sided cavity system, in which a singly charged quantum dot is embedded in a double-sided optical microcavity with partially reflective top and bottom mirrors. The implementation of the scheme mainly depends on the interaction between the input single-photon pulse and the spins of electrons in the coupling system. Discussions about the effect of the cavity loss, side leakage and exciton–cavity coupling strength for the fidelity of generated states show that the fidelity can remain high enough by controlling these parameters. Therefore, the current scheme is feasible in the experiment.
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31

Popov, I. I., I. A. Arkhireev, N. S. Vashurin, et al. "Study of the trion spectral lines broadening in the thin Si(p)/Si(b)/ZnO film caused by the exciton-phonon interaction and other factors." EPJ Web of Conferences 220 (2019): 01009. http://dx.doi.org/10.1051/epjconf/201922001009.

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Experiments were carried out to study the contribution of the phonon wing to the uniform width of exciton states localized at room temperature on surface defects of the crystal lattice of thin single-layer and three-layer films. Technological studies were carried out to reproduce the parameters of a three-layer thin textured Si (P) / Si (B) / ZnO film to create a technology for the production of femtosecond time interval recorders based on the non-Faraday rotation of the polarized vector of the stimulated photon echo. The results of technological methods for studying the physics of the formation of trion states are discussed.
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32

Nabiev, I. "Strong light-matter coupling for optical switching through the fluorescence and FRET control." Journal of Physics: Conference Series 2058, no. 1 (2021): 012001. http://dx.doi.org/10.1088/1742-6596/2058/1/012001.

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Анотація:
Abstract Resonant interaction between excitonic transitions of molecules and localized electromagnetic field forms the hybrid polaritonic states. Tuneable microresonators may change the light-matter coupling strength and modulate them from weak to strong and ultra-strong coupling regimes. In this work we have realised strong coupling between the tuneable open-access cavity mode and the excitonic transitions in oligonucleotide-based molecular beacons with their terminus labelled with a pair of organic dye molecules demonstrating an efficient donor-to-acceptor Förster resonance energy transfer (FRET). We show that the predominant strong coupling of the cavity photon to the exciton transition in the donor dye molecule can lead to such a large an energy shift that the energy transfer from the acceptor exciton reservoir to the mainly donor lower polaritonic state can be achieved, thus yielding the chromophores’ donor–acceptor role reversal or “carnival effect”. The data show the possibility for confined electromagnetic fields to control and mediate polariton-assisted remote energy transfer. Obtained results open the avenues to quantum optical switching and other applications.
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33

Abbarchi, Marco, Takaaki Mano, Takashi Kuroda, Akihiro Ohtake, and Kazuaki Sakoda. "Polarization Anisotropies in Strain-Free, Asymmetric, and Symmetric Quantum Dots Grown by Droplet Epitaxy." Nanomaterials 11, no. 2 (2021): 443. http://dx.doi.org/10.3390/nano11020443.

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Анотація:
We provide an extensive and systematic investigation of exciton dynamics in droplet epitaxial quantum dots comparing the cases of (311)A, (001), and (111)A surfaces. Despite a similar s-shell exciton structure common to the three cases, the absence of a wetting layer for (311)A and (111)A samples leads to a larger carrier confinement compared to (001), where a wetting layer is present. This leads to a more pronounced dependence of the binding energies of s-shell excitons on the quantum dot size and to the strong anti-binding character of the positive-charged exciton for smaller quantum dots. In-plane geometrical anisotropies of (311)A and (001) quantum dots lead to a large electron-hole fine interaction (fine structure splitting (FSS) ∼100 μeV), whereas for the three-fold symmetric (111)A counterpart, this figure of merit is reduced by about one order of magnitude. In all these cases, we do not observe any size dependence of the fine structure splitting. Heavy-hole/light-hole mixing is present in all the studied cases, leading to a broad spread of linear polarization anisotropy (from 0 up to about 50%) irrespective of surface orientation (symmetry of the confinement), fine structure splitting, and nanostructure size. These results are important for the further development of ideal single and entangled photon sources based on semiconductor quantum dots.
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34

James Singh, Konthoujam, Hao-Hsuan Ciou, Ya-Hui Chang, et al. "Optical Mode Tuning of Monolayer Tungsten Diselenide (WSe2) by Integrating with One-Dimensional Photonic Crystal through Exciton–Photon Coupling." Nanomaterials 12, no. 3 (2022): 425. http://dx.doi.org/10.3390/nano12030425.

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Анотація:
Two-dimensional materials, such as transition metal dichalogenides (TMDs), are emerging materials for optoelectronic applications due to their exceptional light–matter interaction characteristics. At room temperature, the coupling of excitons in monolayer TMDs with light opens up promising possibilities for realistic electronics. Controlling light–matter interactions could open up new possibilities for a variety of applications, and it could become a primary focus for mainstream nanophotonics. In this paper, we show how coupling can be achieved between excitons in the tungsten diselenide (WSe2) monolayer with band-edge resonance of one-dimensional (1-D) photonic crystal at room temperature. We achieved a Rabi splitting of 25.0 meV for the coupled system, indicating that the excitons in WSe2 and photons in 1-D photonic crystal were coupled successfully. In addition to this, controlling circularly polarized (CP) states of light is also important for the development of various applications in displays, quantum communications, polarization-tunable photon source, etc. TMDs are excellent chiroptical materials for CP photon emitters because of their intrinsic circular polarized light emissions. In this paper, we also demonstrate that integration between the TMDs and photonic crystal could help to manipulate the circular dichroism and hence the CP light emissions by enhancing the light–mater interaction. The degree of polarization of WSe2 was significantly enhanced through the coupling between excitons in WSe2 and the PhC resonant cavity mode. This coupled system could be used as a platform for manipulating polarized light states, which might be useful in optical information technology, chip-scale biosensing and various opto-valleytronic devices based on 2-D materials.
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35

Bendib, A., K. Bendib-Kalache, and C. Deutsch. "Optical breakdown threshold in fused silica with femtosecond laser pulses." Laser and Particle Beams 31, no. 3 (2013): 523–29. http://dx.doi.org/10.1017/s0263034613000396.

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Анотація:
AbstractA theoretical model for electrons in the conduction band intend to investigate the optical breakdown threshold in femtosecond laser pulse-fused silica interaction is presented. The model is derived from a rate equation that includes the avalanche and multi-photon ionization processes of Thornber and Keldysh, respectively, and also the three-body and exciton recombination mechanisms. In addition, the time evolution of electron mean energy is also considered through the energy balance equation. The mean energy acts as a trigger for the avalanche mechanism. The evolution of electron density profiles is calculated and discussed with respect to the ionization and recombination mechanisms. The results for the fluence threshold as a function of the pulse duration fall in good agreement with the experimental data reported in the literature.
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36

Abbarchi, Marco, Takaaki Mano, Takashi Kuroda, and Kazuaki Sakoda. "Exciton Dynamics in Droplet Epitaxial Quantum Dots Grown on (311)A-Oriented Substrates." Nanomaterials 10, no. 9 (2020): 1833. http://dx.doi.org/10.3390/nano10091833.

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Анотація:
Droplet epitaxy allows the efficient fabrication of a plethora of 3D, III–V-based nanostructures on different crystalline orientations. Quantum dots grown on a (311)A-oriented surface are obtained with record surface density, with or without a wetting layer. These are appealing features for quantum dot lasing, thanks to the large density of quantum emitters and a truly 3D lateral confinement. However, the intimate photophysics of this class of nanostructures has not yet been investigated. Here, we address the main optical and electronic properties of s-shell excitons in individual quantum dots grown on (311)A substrates with photoluminescence spectroscopy experiments. We show the presence of neutral exciton and biexciton as well as positive and negative charged excitons. We investigate the origins of spectral broadening, identifying them in spectral diffusion at low temperature and phonon interaction at higher temperature, the presence of fine interactions between electron and hole spin, and a relevant heavy-hole/light-hole mixing. We interpret the level filling with a simple Poissonian model reproducing the power excitation dependence of the s-shell excitons. These results are relevant for the further improvement of this class of quantum emitters and their exploitation as single-photon sources for low-density samples as well as for efficient lasers for high-density samples.
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37

Corovai, A. V., and P. I. Khadzhi. "Nonlinear interaction of ultrashort light pulses with a thin semiconductor film under conditions of two-photon exciton-biexciton conversion." Quantum Electronics 30, no. 12 (2000): 1091–93. http://dx.doi.org/10.1070/qe2000v030n12abeh001872.

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38

Wang, Naien, Yunfei Zou, Lulu Wang, and Li Yu. "Theoretical study on amplifying strong exciton–photon coupling based on surface plasmon in a hybridized perovskite nanowire-metal film-perovskite nanowire structure." Modern Physics Letters B 35, no. 20 (2021): 2150336. http://dx.doi.org/10.1142/s021798492150336x.

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Анотація:
We theoretically report a strong light–matter interaction in a sandwich structure composed of hybridized inorganic–organic perovskite nanowires, silica (SiO2) films and a silver (Ag) film. Surface plasmon effectively enhances the strong exciton–photon coupling strength of perovskite nanowires, which depends on reduction of effective mode volume and local field enhancement. By calculation, we find that the thicknesses of SiO2 and Ag films can affect the coupling strength. With the suitable thickness of SiO2 (5 nm) and Ag (30 nm) films, Rabi splitting can reach 319 meV, while without an Ag film Rabi splitting is only 270 meV. Furthermore, Rabi splitting shows a negative correlation with SiO2 film thickness within a limited range. Still, it has a nonlinear relation with Ag film thickness because the imaginary part of the effective index for the hybridized mode shows a nonlinear relation with Ag film thickness. Our structure provides suitable parameters for the experiment and has potential application in nano-lasers.
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39

Krivenkov, Victor, Pavel Samokhvalov, Ivan S. Vasil'evskii, Nikolai I. Kargin, and Igor Nabiev. "Plasmon–exciton interaction strongly increases the efficiency of a quantum dot-based near-infrared photodetector operating in the two-photon absorption mode under normal conditions." Nanoscale 13, no. 47 (2021): 19929–35. http://dx.doi.org/10.1039/d1nr06229h.

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40

Yan, Xiao-Hong, Yi-Jie Niu, Hong-Xing Xu, and Hong Wei. "Strong coupling of single plasmonic nanoparticles and nanogaps with quantum emitters." Acta Physica Sinica 71, no. 6 (2022): 067301. http://dx.doi.org/10.7498/aps.71.20211900.

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Анотація:
In cavity quantum electrodynamics, when the interaction between quantum emitter and cavity mode is strong enough to overcome the mean decay rate of the system, it will enter into a strong coupling regime, thereby forming part-light part-matter polariton states. Strong coupling can serve as a promising platform for room temperature Bose-Einstein condensation, polariton lasing, single photon nonlinearity, quantum information, etc. Localized surface plasmons supported by single metal nanostructures possess extremely small mode volume, which is favorable for realizing strong coupling. Moreover, the nanoscale dimensions of plasmonic structures can facilitate the miniaturization of strong coupling systems. Here, the research progress of strong plasmon-exciton coupling between single metal nanoparticles/nanogaps and quantum emitters is reviewed. The theory background of strong coupling is first introduced, including quantum treatment, classical coupled oscillator model, as well as the analytical expressions for scattering and photoluminescence spectra. Then, strong coupling between different kinds of plasmonic nanostructures and quantum emitters is reviewed. Single metal nanoparticles, nanoparticle dimers, and nanoparticle-on-mirror structures constitute the most typical plasmonic nanostructures. The nanogaps in the latter two systems can highly concentrate electromagnetic field, providing optical nanocavities with smaller mode volume than single nanoparticles. Therefore, the larger coupling strength can be achieved in the nanogap systems, which is conducive to strong coupling at the single-exciton level. In addition, the active tuning of strong coupling based separately on thermal, electrical and optical means are reviewed. The energy and oscillator strength of the excitons in transition metal dichalcogenide (TMDC) monolayers are dependent on temperature. Therefore, the strong coupling can be tuned by heating or cooling the system. The excitons in TMDC monolayers can also be tuned by electrical gating, enabling electrical control of strong coupling. Optically tuning the quantum emitters provides another way to actively control the strong coupling. Overall, the research on active tuning of strong plasmon-exciton coupling is still very limited, and more investigations are needed. Finally, this review is concluded with a short summary and the prospect of this field.
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41

Zhang, Z. L., M. Nishioka, C. Weisbuch, and Y. Arakawa. "Demonstration of confined optical field effect in a vertical microcavity by examining the low temperature photon‐exciton interaction in two kinds of quantum wells." Applied Physics Letters 64, no. 9 (1994): 1068–70. http://dx.doi.org/10.1063/1.110934.

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42

NGUYEN, BA AN, and THAI HOA TRAN. "GENERATION OF SQUEEZED EXCITONS IN SEMICONDUCTORS BY COHERENT LIGHT." Modern Physics Letters B 06, no. 07 (1992): 405–10. http://dx.doi.org/10.1142/s0217984992000491.

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Анотація:
In this letter, we show that semiconductor excitons generated by coherent light may become squeezed. This is due to their interactions both with the light and among themselves. Based on a polariton theory and using a secular approximation, analytical expressions for exciton quadrature variances have been derived, which enable us to study easily the dependence of exciton squeezing degree on the pumping light intensity, frequency detuning and strength of exciton-exciton, as well as exciton-photon, interactions.
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43

OGAWA, TETSUO, and SATORU OKUMURA. "BOSONIZATION OF TWO-FERMION COMPOSITES WITH AN ARBITRARY INTERNAL MOTION: APPLICATION TO CORRELATED 1s EXCITON SYSTEMS." International Journal of Modern Physics B 15, no. 28n30 (2001): 3916–19. http://dx.doi.org/10.1142/s0217979201008998.

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Анотація:
We propose an exact bosonization scheme for two two-fermion composites with identical internal structures, that is, a mapping of the two-exciton (four-fermion) subspace to a two-boson subspace. We obtain analytical, exact expressions of the boson-boson interactions and the boson-photon ones taking into full account that the commutation relation of the composite bosons deviates from the ideal-boson commutation due to internal motions of the composite. We can distinguish the "composite-particle effects' from the Coulomb interactions among the fermions in the interactions. With this method, origins of optical nonlinearity in a system with two 1s excitons are studied in terms of the mutual excitonic correlations and exciton-photon interactions.
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44

Qian, Chenjiang, Xin Xie, Jingnan Yang, and Xiulai Xu. "A Cratered Photonic Crystal Cavity Mode for Nonlocal Exciton–Photon Interactions." Advanced Quantum Technologies 3, no. 2 (2019): 1900024. http://dx.doi.org/10.1002/qute.201900024.

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45

DAN, NGUYEN TRUNG, NGUYEN BA AN, and LE NGOC MINH. "CHAOTIC DYNAMICS OF HIGH DENSITY PHOTON AND EXCITON SYSTEM." International Journal of Modern Physics B 07, no. 12 (1993): 2325–37. http://dx.doi.org/10.1142/s0217979293002869.

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Анотація:
We consider nonlinear dynamics of a system of interacting photons and excitons driven by a resonantly exciting light field. Using the linear stability analysis for nonlinear coupled equations of photon and exciton operators we investigated that, besides the usual unstable domain which is a negative slope branch, there are other unstable ones in the leftmost and rightmost sides of the lower and upper branches of the frequency-density bistable curves. Numerical study shows that the system has very rich information on the instability nature and a self-oscillation process leading to chaos can occur in these unstable domains.
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46

Yeo, Inah, Doukyun Kim, Kyu-Tae Lee, et al. "Comparative Chemico-Physical Analyses of Strain-Free GaAs/Al0.3Ga0.7As Quantum Dots Grown by Droplet Epitaxy." Nanomaterials 10, no. 7 (2020): 1301. http://dx.doi.org/10.3390/nano10071301.

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Анотація:
We investigate the quantum confinement effects on excitons in several types of strain-free GaAs/Al 0.3 Ga 0.7 As droplet epitaxy (DE) quantum dots (QDs). By performing comparative analyses of energy-dispersive X-ray spectroscopy with the aid of a three-dimensional (3D) envelope-function model, we elucidate the individual quantum confinement characteristics of the QD band structures with respect to their composition profiles and the asymmetries of their geometrical shapes. By precisely controlling the exciton oscillator strength in strain-free QDs, we envisage the possibility of tailoring light-matter interactions to implement fully integrated quantum photonics based on QD single-photon sources (SPSs).
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47

Li, Han, Yating Ma, Yizhen Sui, et al. "Valley depolarization in downconversion and upconversion emission of monolayer WS2 at room temperature." Nanophotonics 9, no. 16 (2020): 4809–18. http://dx.doi.org/10.1515/nanoph-2020-0483.

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Анотація:
AbstractBenefiting from strong photon–exciton and phonon–exciton interactions in atomic thickness, transition metal dichalcogenides (TMDCs) are viewed as one promising platform for exploring elementary excitonic photoluminescence (PL) and intrinsic spin–valley properties at the monolayer limit. Despite well-studied Stokes downconversion (DC) PL, the anti-Stokes upconversion (UC) PL has been recently reported in TMDC monolayers, which mainly focus on UC mechanisms while detailed valley-related dynamical processes are unwittingly less concerned. Here, we carry out an in-depth investigation on both DC and UC emission features of monolayer WS2 at room temperature, where UC PL persists with energy gain up to 190 meV. The PL excitation and power-dependent experiments clearly distinguish the origins of DC PL and UC PL, which refer to saturated absorption and phonon-assisted transition from charged trions to neutral A-excitons. And contrast valley properties are observed in DC and UC scenarios with polarization-resolved PL and pump–probe measurements. According to the experimental facts, phenomenological dynamical DC and UC scenarios are modeled with intervalley depolarization taken into consideration, in which intermediates from spontaneous intervalley depolarization account for the observed emission and valley properties. This work can help understand the light–matter interactions and valley properties in monolayer TMDCs.
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48

Takeno, Shozo. "Coherent States and Envelope Kinklike Exciton-Photon Coupled Modes in Nonlinear Frenkel Excitons Interacting with Radiation Fields." Journal of the Physical Society of Japan 62, no. 8 (1993): 2894–903. http://dx.doi.org/10.1143/jpsj.62.2894.

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49

Gil, Bernard, Guillaume Cassabois, Ramon Cusco, Giorgia Fugallo, and Lluis Artus. "Boron nitride for excitonics, nano photonics, and quantum technologies." Nanophotonics 9, no. 11 (2020): 3483–504. http://dx.doi.org/10.1515/nanoph-2020-0225.

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Анотація:
AbstractWe review the recent progress regarding the physics and applications of boron nitride bulk crystals and its epitaxial layers in various fields. First, we highlight its importance from optoelectronics side, for simple devices operating in the deep ultraviolet, in view of sanitary applications. Emphasis will be directed towards the unusually strong efficiency of the exciton–phonon coupling in this indirect band gap semiconductor. Second, we shift towards nanophotonics, for the management of hyper-magnification and of medical imaging. Here, advantage is taken of the efficient coupling of the electromagnetic field with some of its phonons, those interacting with light at 12 and 6 µm in vacuum. Third, we present the different defects that are currently studied for their propensity to behave as single photon emitters, in the perspective to help them becoming challengers of the NV centres in diamond or of the double vacancy in silicon carbide in the field of modern and developing quantum technologies.
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50

Chan, Yang-Hao, Diana Y. Qiu, Felipe H. da Jornada, and Steven G. Louie. "Giant exciton-enhanced shift currents and direct current conduction with subbandgap photo excitations produced by many-electron interactions." Proceedings of the National Academy of Sciences 118, no. 25 (2021): e1906938118. http://dx.doi.org/10.1073/pnas.1906938118.

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Анотація:
Shift current is a direct current generated from nonlinear light–matter interaction in a noncentrosymmetric crystal and is considered a promising candidate for next-generation photovoltaic devices. The mechanism for shift currents in real materials is, however, still not well understood, especially if electron–hole interactions are included. Here, we employ a first-principles interacting Green’s-function approach on the Keldysh contour with real-time propagation to study photocurrents generated by nonlinear optical processes under continuous wave illumination in real materials. We demonstrate a strong direct current shift current at subbandgap excitation frequencies in monolayer GeS due to strongly bound excitons, as well as a giant excitonic enhancement in the shift current coefficients at above bandgap photon frequencies. Our results suggest that atomically thin two-dimensional materials may be promising building blocks for next-generation shift current devices.
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