Articoli di riviste: "Optical nanosources"

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Van Labeke, D., D. Barchiesi e F. Baida. "Optical characterization of nanosources used in scanning near-field optical microscopy". Journal of the Optical Society of America A 12, n. 4 (1 aprile 1995): 695. http://dx.doi.org/10.1364/josaa.12.000695.

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Viste, Pierre, Jérome Plain, Rodolphe Jaffiol, Alexandre Vial, Pierre Michel Adam e Pascal Royer. "Enhancement and Quenching Regimes in Metal−Semiconductor Hybrid Optical Nanosources". ACS Nano 4, n. 2 (5 gennaio 2010): 759–64. http://dx.doi.org/10.1021/nn901294d.

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Aouani, Heykel, Miguel Navarro-Cia, Mohsen Rahmani, Themistoklis P. H. Sidiropoulos, Minghui Hong, Rupert F. Oulton e Stefan A. Maier. "Multiresonant Broadband Optical Antennas As Efficient Tunable Nanosources of Second Harmonic Light". Nano Letters 12, n. 9 (27 agosto 2012): 4997–5002. http://dx.doi.org/10.1021/nl302665m.

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Petronijevic, Emilija, Ramin Ghahri e Concita Sibilia. "Plasmonic Elliptical Nanohole Arrays for Chiral Absorption and Emission in the Near-Infrared and Visible Range". Applied Sciences 11, n. 13 (28 giugno 2021): 6012. http://dx.doi.org/10.3390/app11136012.

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Chiral plasmonic nanostructures with tunable handedness-dependent absorption in the visible and infrared offer chiro-optical control at the nanoscale. Moreover, coupling them with emitting layers could lead to chiral nanosources, important for nanophotonic circuits. Here, we propose plasmonic elliptical nanohole arrays (ENHA) for circularly dependent near-infrared and visible emission. We first investigate broadband chiral behavior in an Au-ENHA embedded in glass by exciting it with plane waves. We then study the coupling of ENHA with a thin emitting layer embedded in glass; we focus on the emission wavelengths which provided high chirality in plane-wave simulations. Our novel simulation set-up monitors the chirality of the far-field emission by properly averaging a large set of homogeneously distributed, randomly oriented quantum sources. The intrinsic chirality of ENHA influences the circular polarization degree of the emitting layer. Finally, we study the emission dependence on the field distribution at the excitation wavelength. We demonstrate the chiral absorption and emission properties for Au-ENHA emitting in the near-infrared range, and for Ag-ENHA which is excited in green range and emits in the Lumogen Red range. The simple geometry of ENHA can be fabricated with low-cost nanosphere lithography and be covered with emission gel. We thus believe that this design can be of great importance for tunable chiral nanosources.

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Abid, Inès, Javier González-Colsa, Christophe Naveaux, Andreea Campu, Célia Arib, Monica Focsan, Pablo Albella, Mathieu Edely e Marc Lamy de La Chapelle. "Correlation between Plasmonic and Thermal Properties of Metallic Nanoparticles". Nanomaterials 14, n. 10 (7 maggio 2024): 820. http://dx.doi.org/10.3390/nano14100820.

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Here, we investigate the correlation between the heat generated by gold nanoparticles, in particular nanospheres and nanobipyramids, and their plasmonic response manifested by the presence of Localized Surface Plasmon Resonances (LSPRs). Using a tunable laser and a thermal camera, we measure the temperature increase induced by colloidal nanoparticles in an aqueous solution as a function of the excitation wavelength in the optical regime. We demonstrate that the photothermal performances of the nanoparticles are strongly related not only to their plasmonic properties but also to the size and shape of the nanoparticles. The contribution of the longitudinal and transversal modes in gold nanobipyramids is also analyzed in terms of heat generation. These results will guide us to design appropriate nanoparticles to act as efficient heat nanosources.

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Francs, G. Colas des, J. Barthes, A. Bouhelier, J. C. Weeber, A. Dereux, A. Cuche e C. Girard. "Plasmonic Purcell factor and coupling efficiency to surface plasmons. Implications for addressing and controlling optical nanosources". Journal of Optics 18, n. 9 (22 agosto 2016): 094005. http://dx.doi.org/10.1088/2040-8978/18/9/094005.

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Postigo, P. A., A. R. Alija, L. J. Martínez, M. L. Dotor, D. Golmayo, J. Sánchez-Dehesa, C. Seassal et al. "Laser nanosources based on planar photonic crystals as new platforms for nanophotonic devices". Photonics and Nanostructures - Fundamentals and Applications 5, n. 2-3 (ottobre 2007): 79–85. http://dx.doi.org/10.1016/j.photonics.2007.07.004.

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Hoang, Thi Hong Cam, Thanh Binh Pham, Thuy Van Nguyen, Van Dai Pham, Huy Bui, Van Hoi Pham, Elena Duran et al. "Hybrid Integrated Nanophotonic Silicon-based Structures". Communications in Physics 29, n. 4 (16 dicembre 2019): 481. http://dx.doi.org/10.15625/0868-3166/29/4/13855.

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We report nanophotonic silicon-based devices for hybrid integration: 1D photonic crystal (PhC) on optical fiber, i. e. fiber Bragg grating (FBG) sensing probe integrated in fiber laser structure for chemical sensors and slotted planar 2D PhC cavity combined with carbon nanotube (CNT) towards light nanosources. The experiments have been carried out by integrating 1D PhC on optical fiber in fiber laser structure. This structure possesses many advantages including high resolution for wavelength shift, high optical signal-to-noise ratio (OSNR) of about 50~dB, the small full width at half-maximum (FWHM) of about 0.014~nm therefore its accuracy is enhanced, as well as the precision and capability are achieved for remote sensing. Low nitrate concentration in water from 0 to 80 ppm has been used to demonstrate its sensing ability in the experiment. The proposed sensor can work with good repeatability, rapid response, and its sensitivity can be obtained of \(3.2\times 10^{ - 3}\) nm/ppm with the limit of detection (LOD) of 3~ppm. For 2D PhC cavity, enhancement of photoluminescence of CNT emission is observed. The semiconducting single-walled carbon nanotubes (s-SWNTs) solution was prepared by polymer-sorted method and coupled with the confined modes in silicon slotted PhC cavities. The enhancement ratio of 1.15 is obtained by comparing between the PL peaks at two confined modes of the cavity. The PL enhancement result of the integrated system shows the potential for the realization of on-chip nanoscale sources.

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Palermo, Giovanna, Roberto Caputo, Antonio De Luca e Cesare Paolo Umeton. "Control of the optically induced heating of gold nanoparticles". Photonics Letters of Poland 9, n. 1 (31 marzo 2017): 17. http://dx.doi.org/10.4302/plp.v9i1.706.

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Gold nanoparticles (GNPs) have proven to be good nano-sources of heat in the presence of specific electromagnetic radiation. This process, in fact, becomes strongly enhanced under plasmon resonance. In particular, the amount of generated heat and the consequent temperature increase depend on the number of GNPs that are collectively excited and on their relative distance. As a result, the regime of heat localization is deeply controlled by this last parameter. Full Text: PDF ReferencesHutter, E., and Fendler, J. H. "Exploitation of localized surface plasmon resonance". Advanced Materials 16.19, 1685-1706 (2004) CrossRef Liz-Marzán, L. M., Murphy, C. J., & Wang, J. "Nanoplasmonics". Chemical Society Reviews, 43(11), 3820-3822 (2014). CrossRef Maier, S. A. "Plasmonics: fundamentals and applications". Springer Science & Business Media (2007). CrossRef Palpant, B. "Photothermal properties of gold nanoparticles. Gold nanoparticles in physics, chemistry and biology". Imperial College Press, London, (2012). DirectLink Baffou, G. and Quidant R. "Thermo-plasmonics: using metallic nanostructures as nanosources of heat". Laser & Photonics Reviews, 7(2):171?187, (2013). CrossRef Pelton, M., Aizpurua, J., & Bryant, G. "Metal?nanoparticle plasmonics". Laser & Photonics Reviews, 2(3), 136-159 (2008). CrossRef Kreibig, U., & Vollmer, M. "Optical properties of metal clusters" (Vol. 25). Springer Science & Business Media (2013). DirectLink J., Prashant K., S. Eustis, and M. A. El-Sayed. "Plasmon coupling in nanorod assemblies: optical absorption, discrete dipole approximation simulation, and exciton-coupling model." The Journal of Physical Chemistry B 110 (37) 18243-18253 (2006). CrossRef Jain, P. K., & El-Sayed, M. A. "Surface plasmon coupling and its universal size scaling in metal nanostructures of complex geometry: elongated particle pairs and nanosphere trimmers". The Journal of Physical Chemistry C, 112(13), 4954-4960 (2008). CrossRef Chapuis, P. O., Laroche, M., Volz, S., & Greffet, J. J. "Radiative heat transfer between metallic nanoparticles". Applied Physics Letters, 92(20), 201906 (2008). CrossRef Jain, P. K., & El-Sayed, M. A. "Plasmonic coupling in noble metal nanostructures". Chemical Physics Letters, 487(4), 153-164 (2010). CrossRef Cataldi, U., Caputo, R., Kurylyak, Y., Klein, G., Chekini, M. Cesare Umeton, C., Bürgi, T. "Growing gold nanoparticles on a flexible substrate to enable simple mechanical control of their plasmonic coupling". J. Mater. Chem. C, 2, 7927-7933 (2014). CrossRef

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FANG, ZHEYU, QI HONG, CHEN WANG e XING ZHU. "PLASMONIC FOCUSING BASED ON CdS NANORIBBON". Journal of Nonlinear Optical Physics & Materials 19, n. 04 (dicembre 2010): 729–35. http://dx.doi.org/10.1142/s0218863510005686.

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In this paper, we propose and simulate the surface plasmon polariton nanofocusing process by using Finite-difference Time-domain (FDTD) method. The maximum enhancement factor at the taper end area is optimized with different wavelength of the excitation laser. With the advantage of SNOM, the SPP nanofocusing is experimentally observed by illuminating the tapered CdS nanoribbon deposited on the Ag film. The SPP dispersion is used to predict the optimal taper angles of the structure. As the emission of the focused SPP at the taper end, the proposed plasmonic structure can be severed as a light nanosource emitter in the future optical integrated circuits.

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Romeira, Bruno, José M. L. Figueiredo e Julien Javaloyes. "NanoLEDs for energy-efficient and gigahertz-speed spike-based sub-λ neuromorphic nanophotonic computing". Nanophotonics 9, n. 13 (25 giugno 2020): 4149–62. http://dx.doi.org/10.1515/nanoph-2020-0177.

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AbstractEvent-activated biological-inspired subwavelength (sub-λ) photonic neural networks are of key importance for future energy-efficient and high-bandwidth artificial intelligence systems. However, a miniaturized light-emitting nanosource for spike-based operation of interest for neuromorphic optical computing is still lacking. In this work, we propose and theoretically analyze a novel nanoscale nanophotonic neuron circuit. It is formed by a quantum resonant tunneling (QRT) nanostructure monolithic integrated into a sub-λ metal-cavity nanolight-emitting diode (nanoLED). The resulting optical nanosource displays a negative differential conductance which controls the all-or-nothing optical spiking response of the nanoLED. Here we demonstrate efficient activation of the spiking response via high-speed nonlinear electrical modulation of the nanoLED. A model that combines the dynamical equations of the circuit which considers the nonlinear voltage-controlled current characteristic, and rate equations that takes into account the Purcell enhancement of the spontaneous emission, is used to provide a theoretical framework to investigate the optical spiking dynamic properties of the neuromorphic nanoLED. We show inhibitory- and excitatory-like optical spikes at multi-gigahertz speeds can be achieved upon receiving exceptionally low (sub-10 mV) synaptic-like electrical activation signals, lower than biological voltages of 100 mV, and with remarkably low energy consumption, in the range of 10–100 fJ per emitted spike. Importantly, the energy per spike is roughly constant and almost independent of the incoming modulating frequency signal, which is markedly different from conventional current modulation schemes. This method of spike generation in neuromorphic nanoLED devices paves the way for sub-λ incoherent neural elements for fast and efficient asynchronous neural computation in photonic spiking neural networks.

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Cao, Shuiyan, Eric Le Moal, Quanbo Jiang, Aurélien Drezet, Serge Huant, Jean-Paul Hugonin, Gérald Dujardin e Elizabeth Boer-Duchemin. "Directional light beams by design from electrically driven elliptical slit antennas". Beilstein Journal of Nanotechnology 9 (3 settembre 2018): 2361–71. http://dx.doi.org/10.3762/bjnano.9.221.

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We report on the low-energy, electrical generation of light beams in specific directions from planar elliptical microstructures. The emission direction of the beam is determined by the microstructure eccentricity. A very simple, broadband, optical antenna design is used, which consists of a single elliptical slit etched into a gold film. The light beam source is driven by an electrical nanosource of surface plasmon polaritons (SPP) that is located at one focus of the ellipse. In this study, SPPs are generated through inelastic electron tunneling between a gold surface and the tip of a scanning tunneling microscope.

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Humbert, Mélodie, Romain Hernandez, Peter Wiecha, Jonas Muller, Etienne Palleau, Frank Fournel, Vincent Larrey et al. "(Invited) Simple and Optimized Silicon Nano-Antennas for Quantum Emitter Control". ECS Meeting Abstracts MA2024-01, n. 22 (9 agosto 2024): 1317. http://dx.doi.org/10.1149/ma2024-01221317mtgabs.

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Improving the brightness and efficiency of single photon sources by the mean of optically resonant nanostructures is a major stake for the development of efficient nanodevices for quantum communications. For a couple of decades, these resonant nanostructures have mainly been made of noble metal that sustain strong localized resonances (LSPR) that can be used to manipulate, concentrate or redirect visible light. Such properties have led to numerous actual or potential applications in integrated optics, sensors, nonlinear optics, field-enhanced spectroscopies, or photovoltaics. Recently, an alternative emerged with high refractive index dielectric nanostructures, which offer the same range of applications as plasmonics by manipulating Mie optical resonances instead of LSPR [1]. These resonances can be efficiently tuned by modifying the size, shape, and material of those nanostructures (e.g. silicon, n ~ 4) [2]. Furthermore, high index dielectric nanostructures offer several key advantages when compared to their metallic counterparts: absorption losses are far weaker for wavelengths longer than the direct band gap, access to semiconductor (CMOS) technology for nanostructure fabrication, and presence of intrinsic strong magnetic and electric resonances, providing an unique opportunity to spatially separate and redistribute the energy of the magnetic and electric parts of the electromagnetic field in the near field, otherwise inextricably connected in the far field [3]. We discuss here the effect of simple high-index dielectric nanoantennas on the spontaneous emission of model quantum emitters. First, we accurately positioned arrays of nanodiamonds hosting NV colored centers in the gap of silicon dimer nanoantennas, using atomic force microscopy (AFM – [4]) nanoxerography [5]. The NV center is an ideal model system exhibiting single photon emission properties at room temperature, which is well adapted for proof of concept experiments in quantum nano-optics. Since the local density of photonic states (LDOS) is modified by the nanostructure, we show by the mean of time-resolved photoluminescence acquisitions that the photodynamics of these quantum emitters can be enhanced by the coupling to the nanoantenna, down to the single photon emission regime [5]. Our experimental results are in good agreement with multipolar analysis and numerical simulations based on the Green Dyadic Method - GDM. Second, in order to go a step further, we explore the control of the directive emission from quantum dipolar sources by the mean of complex silicon antennas. The latter, made of a given number of building (nano)blocks, are optimized by an Evolutionary Algorithm (EA) coupled to full-field electrodynamical GDM simulations. The geometries obtained allow to tailor the emission direction of a single dipolar source, maximizing the intensity of the emitted light within a given solid angle. Our numerical and preliminary experimental results demonstrate the efficiency of such compact EA-optimized antennas for the control of quantum nanosources. Acknowledgements : This work was supported by Programme Investissements d’Avenir through the grants ANR-10-LABX-0037-NEXT (MILO) and NanoX n° ANR-17-EURE- 0009 (Q-META), by the HiLight ANR project ANR-19-CE24-0026, by LAAS-CNRS micro and nanotechnologies platform member of the French Renatech network, by the CNRS and INSA (PhD grant), by the Région Midi-Pyrénées via the Institute for Quantum technologies in Occitanie (IQO), and by the computing facility center CALMIP of the University of Toulouse under grants P12167 and P1107. References : Kallel et al, Tunable enhancement of light absorption and scattering in Si1xGex nanowires, Phys. Rev. B 12: 085318, 2012. P.R. Wiecha et al., Strongly directional scattering from dielectric nanowires, ACS Photonics 4: pp 2036–2046, 2017. Montagnac et al., Control of light emission of quantum emitters coupled to silicon nanoantenna using cylindrical vector beams, Light : Science and Applications 12 (1), 239, 2023. Humbert et al., Versatile, rapid and robust nanopositioning of single-photon emitters by AFM-nanoxerography, Nanotechnology 33, 215301, 2022. Humbert et al., Large-scale controlled coupling of single-photon emitters to high index dielectric nanoantennas using AFM nanoxerography, Nanoscale 15, 599-608, 2023. Figure 1

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Wang, Chu, Yu, Gao e Peng. "Near-Field Enhancement and Polarization Selection of a Nano-System for He-Ne Laser Application". Nanomaterials 9, n. 10 (6 ottobre 2019): 1421. http://dx.doi.org/10.3390/nano9101421.

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In this paper, we focus on transmission behavior based on the single aperture with a scatter. Both the near-field enhancement and polarization selection can be achieved numerically with a proposed nano-system under He-Ne laser wavelength. The nano-system consists of an Ag antenna, a wafer layer, an Ag film with an aperture and a dielectric substrate. Numerical results show that the near-field enhancement is related to the FP-like resonance base on surface plasmon polaritons (SPPs) in the metal–isolator–metal (MIM) waveguide for transverse magnetic (TM) polarization. The near-field optical spot is confined at the aperture export with a maximal electric intensity 20 times the value of the incident field for an antenna length of 430 nm. The transmission cutoff phenomenon for transverse electric (TE) polarization is because the transmission is forbidden for smaller aperture width. High extinction ratios of 9.6×10-8 (or 70.2 dB) and 4.4×10-8 (or 73.6 dB) with antenna lengths of 130 nm and 430 nm are achieved numerically with the nano-system. The polarization selective property has a good angular tolerance for oblique angles smaller than 15°. The spectral response is also investigated. We further demonstrate that the nano-system is applicable for another incident wavelength of 500 nm. Our investigation may be beneficial for the detection of polar molecules or local nano polarized nanosource.

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Rodrigo, José A., Mercedes Angulo e Tatiana Alieva. "Tailored optical propulsion forces for controlled transport of resonant gold nanoparticles and associated thermal convective fluid flows". Light: Science & Applications 9, n. 1 (27 ottobre 2020). http://dx.doi.org/10.1038/s41377-020-00417-1.

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Abstract Noble metal nanoparticles illuminated at their plasmonic resonance wavelength turn into heat nanosources. This phenomenon has prompted the development of numerous applications in science and technology. Simultaneous optical manipulation of such resonant nanoparticles could certainly extend the functionality and potential applications of optothermal tools. In this article, we experimentally demonstrate optical transport of single and multiple resonant nanoparticles (colloidal gold spheres of radius 200 nm) directed by tailored transverse phase-gradient forces propelling them around a 2D optical trap. We show how the phase-gradient force can be designed to efficiently change the speed of the nanoparticles. We have found that multiple hot nanoparticles assemble in the form of a quasi-stable group whose motion around the laser trap is also controlled by such optical propulsion forces. This assembly experiences a significant increase in the local temperature, which creates an optothermal convective fluid flow dragging tracer particles into the assembly. Thus, the created assembly is a moving heat source controlled by the propulsion force, enabling indirect control of fluid flows as a micro-optofluidic tool. The existence of these flows, probably caused by the temperature-induced Marangoni effect at the liquid water/superheated water interface, is confirmed by tracking free tracer particles migrating towards the assembly. We propose a straightforward method to control the assembly size, and therefore its temperature, by using a nonuniform optical propelling force that induces the splitting or merging of the group of nanoparticles. We envision further development of microscale optofluidic tools based on these achievements.

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Cui, Lingfei, Xingyu Yang, Benoît Reynier, Catherine Schwob, Sébastien Bidault, Bruno Gallas e Mathieu Mivelle. "Achiral Magnetic Photonic Antenna as a Tunable Nanosource of Chiral Light". ACS Photonics, 8 settembre 2023. http://dx.doi.org/10.1021/acsphotonics.3c00281.

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He, Yonglin, Wang Jingyu, Weimin Yang e Shengjie Jiang. "Magnetic modes for enhancing second harmonic generation at ultraviolet frequencies". Physica Scripta, 9 aprile 2024. http://dx.doi.org/10.1088/1402-4896/ad3c73.

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Abstract Enhancing nonlinear frequency conversions at ultraviolet (UV) frequencies holds immense significance in contemporary physics and nanophotonics. In this work, we have theoretically demonstrated a highly efficient UV second-harmonic generation (SHG) in the Al nanorod−LiNbO3 (LN)−Al film nanostructure by two orders of magnitude higher compared to the conventional LiNbO3 nanostructure in this range. This result is acquired by designing a simple Al nanoparticle-Al film plasmonic system that generates magnetic resonances at near-UV frequencies to confine light to the LN, which can highly enhance the electromagnetic field and lead to strong interactions with the large nonlinear susceptibility. Our research provides profound insights into the pivotal role of plasmon-induced magnetic resonance (PIMR) modes in UV-SHG processes, thereby opening up new avenues for the development of nanoscale UV nanosources and nonlinear metasurface applications at subwavelength scale.

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Articoli di riviste sul tema "Optical nanosources"

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