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Journal articles on the topic 'Circularly polarized thermal radiation'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Sun, Yasong, Derui Zhang, Biyuan Wu, Haotuo Liu, Bing Yang, and Xiaohu Wu. "Metasurfaces Assisted Twisted α-MoO3 for Spinning Thermal Radiation." Micromachines 13, no. 10 (October 17, 2022): 1757. http://dx.doi.org/10.3390/mi13101757.

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Spinning thermal radiation has demonstrated applications in engineering, such as radiation detection and biosensing. In this paper, we propose a new spin thermal radiation emitter composed of the twisted bilayer α-MoO3 metasurface; in our study, it provided more degrees of freedom to control circular dichroism by artificially modifying the filling factor of the metasurface. In addition, circular dichroism was significantly enhanced by introducing a new degree of freedom (filling factor), with a value that could reach 0.9. Strong-spin thermal radiation resulted from the polarization conversion of circularly polarized waves using the α-MoO3 metasurface and selective transmission of linearly polarized waves by the substrate. This allowed for extra flexible control of spinning thermal radiation and significantly enhanced circular dichroism, which promises applications in biosensing and radiation detection. As a result of their unique properties, hyperbolic materials have applications not only in spin thermal radiation, but also in areas such as near-field thermal radiation. In this study, hyperbolic materials were combined with metasurfaces to offer a new idea regarding modulating near-field radiative heat transfer.

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2

Lee, Jeffrey Chi Wai, and C. T. Chan. "Circularly polarized thermal radiation from layer-by-layer photonic crystal structures." Applied Physics Letters 90, no. 5 (January 29, 2007): 051912. http://dx.doi.org/10.1063/1.2435958.

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3

Leto, P., C. Trigilio, C. S. Buemi, F. Leone, I. Pillitteri, L. Fossati, F. Cavallaro, et al. "The auroral radio emission of the magnetic B-type star ρ OphC." Monthly Notices of the Royal Astronomical Society: Letters 499, no. 1 (September 10, 2020): L72—L76. http://dx.doi.org/10.1093/mnrasl/slaa157.

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ABSTRACT The non-thermal radio emission of main-sequence early-type stars is a signature of stellar magnetism. We present multiwavelength (1.6–16.7 GHz) ATCA measurements of the early-type magnetic star ρ OphC, which is a flat-spectrum non-thermal radio source. The ρ OphC radio emission is partially circularly polarized with a steep spectral dependence: the fraction of polarized emission is about $60{{\ \rm per\ cent}}$ at the lowest frequency sub-band (1.6 GHz) while is undetected at 16.7 GHz. This is clear evidence of coherent Auroral Radio Emission (ARE) from the ρ OphC magnetosphere. Interestingly, the detection of the ρ OphC’s ARE is not related to a peculiar rotational phase. This is a consequence of the stellar geometry, which makes the strongly anisotropic radiation beam of the amplified radiation always pointed towards Earth. The circular polarization sign evidences mainly amplification of the ordinary mode of the electromagnetic wave, consistent with a maser amplification occurring within dense regions. This is indirect evidence of the plasma evaporation from the polar caps, a phenomenon responsible for the thermal X-ray aurorae. ρ OphC is not the first early-type magnetic star showing the O-mode dominated ARE but is the first star with the ARE always on view.

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4

Chang, Cheng-Hsing, Ting-Yi Chung, and Ching-Shiang Hwang. "Mechanical characterization of an APPLE undulator at TPS." Journal of Instrumentation 17, no. 07 (July 1, 2022): T07010. http://dx.doi.org/10.1088/1748-0221/17/07/t07010.

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Abstract Because of a strong demand for circularly polarized radiation, elliptically polarized undulators (EPU) are widely used in synchrotron light source nowadays. At Taiwan Photon Source (TPS) with a 3-GeV ring, the EPU plays an important role to fulfill the needs of the user community for EUV to soft X-ray. Up to phase II, in total five EPU have been installed. Because multiple operating modes are necessary, the EPU suffers changes in attractive and repulsive forces in three directions, in contrast to a general ID, which suffers only a vertical attraction. A mechanical structure of the EPU is required that can withstand multiple stresses and eliminate mechanical deformation. In addition, the EPU, a purely magnetic structure, is sensitive to high-permeability material, which makes the overall structure a heterogeneous material, resulting in a problem with uneven thermal expansion and contraction because of changes in ambient temperature. Here we discuss and propose solutions to resist force and temperature variations of EPU mechanical structures, which includes mechanical simulation and inspection.

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5

Maslov, V. P. "INVESTIGATION OF THERMAL RADIATION ANGULAR AND POLARIZATION CHARACTERISTICS OF ONE-DIMENSIONAL PHOTONIC STRUCTURES ON A FINITE SUBSTRATE." Optoelektronìka ta napìvprovìdnikova tehnìka 56 (December 7, 2021): 83–88. http://dx.doi.org/10.15407/iopt.2021.56.083.

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One-dimensional photonic structures (PS) are the layered metamaterials, which optical properties are due to interference effects within the structure. Due to the interaction of electromagnetic waves with the periodic structure, the thermal radiation (TR) of such PS has the features of coherent: it has a selective spectrum and a petal pattern. The relevance of TR PS research is due to the search for new materials to create sources of infrared (IR) radiation in the middle and far IR range (with a wavelength > 5 μm). The second important area of application of the radiating properties of the PS is the creation of non-radiating coatings to remove unwanted TR from the heated surfaces of the IR devices. Despite the fact that the irradiative properties of PS have been studied quite well, in the literature insufficient attention is paid to the influence of the finite substrate on the parameters of TR structures. The influence of a finite incoherent substrate on the angular and polarization characteristics of the thermal radiation of the system (photonic structure)/substrate has been investigated. Systems consisting of plane-parallel Ge or Si plates as PS and incoherent BaF2, BaF2/Al and Al substrates were used in experimental studies. It has been established, the contrast and amplitude of the directional diagram petals of the TR system depend on the ratio of the optical characteristics of the photonic structure and the substrate. The presence of a strongly reflective substrate eliminates the difference between the angular dependences of the s- and p-polarized components of the TR. In the case when the PS is placed on a transparent incoherent substrate with a lower refractive index, there is an increase in the p-polarized component of the TR and the suppression of the s-polarized. The thermal imaging picture of the TR angular distribution of the Si/Al system has been recorded and it was experimentally proved that the TR of photonic systems exhibits circular patterns. The results of the work can be used in the development of narrowband emitters in the middle and far infrared range, coatings to increase radiation energy exchange and coatings with minimal emissivity that are invisible in the thermal range.

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6

Cao, Tun, Meng Lian, Kuan Liu, Xianchao Lou, Yaoming Guo, and Dongming Guo. "Wideband mid-infrared thermal emitter based on stacked nanocavity metasurfaces." International Journal of Extreme Manufacturing 4, no. 1 (December 9, 2021): 015402. http://dx.doi.org/10.1088/2631-7990/ac3bb1.

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Abstract Efficient thermal radiation in the mid-infrared (M-IR) region is of supreme importance for many applications including thermal imaging and sensing, thermal infrared light sources, infrared spectroscopy, emissivity coatings, and camouflage. The ability to control light makes metasurfaces an attractive platform for infrared applications. Recently, different metamaterials have been proposed to achieve high thermal radiation. To date, broadening the radiation bandwidth of a metasurface emitter (meta-emitter) has become a key goal to enable extensive applications. We experimentally demonstrate a broadband M-IR thermal emitter using stacked nanocavity metasurface consisting of two pairs of circular-shaped dielectric (Si3N4)–metal (Au) stacks. A high thermal radiation can be obtained by engineering the geometry of nanocavity metasurfaces. Such a meta-emitter provides wideband and broad angular absorptance of both p- and s-polarized light, offering a wideband thermal radiation with an average emissivity of more than 80% in the M-IR atmospheric window of 8–14 μm. The experimental illustration together with the theoretical framework establishes a basis for designing broadband thermal emitters, which, as anticipated, will initiate a promising avenue to M-IR sources.

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7

Kollyukh, O. G., A. I. Liptuga, V. Morozhenko, V. I. Pipa, and E. F. Venger. "Circular polarized coherent thermal radiation from semiconductor layers in an external magnetic field." Optics Communications 276, no. 1 (August 2007): 131–34. http://dx.doi.org/10.1016/j.optcom.2007.04.011.

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8

Gubler, Philipp, Naoki Yamamoto, and Di-Lun Yang. "Chiral gravitational waves from thermalized neutrinos in the early Universe." Journal of Cosmology and Astroparticle Physics 2022, no. 09 (September 1, 2022): 025. http://dx.doi.org/10.1088/1475-7516/2022/09/025.

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Abstract We investigate polarized gravitational waves generated by chiral fermions in the early Universe. In particular, we focus on the contribution from left-handed neutrinos in thermal equilibrium with finite temperature and chemical potential in the radiation dominated era. We compute the correlation functions of gravitational fields pertinent to the Stokes parameter V characterizing the circular polarization of gravitational waves in the Minkowski and expanding spacetime backgrounds. In the expanding universe, we find that the thermalized neutrinos induce a non-vanishing V linear to the neutrino degeneracy parameter and wavenumber of gravitational waves in the long wavelength region. While the magnitude of the gravitational waves generated by thermal neutrinos is too small to be detectable by current and planned third generation gravitational wave detectors, their observations by future generation detectors for ultra-high frequency regimes could provide information on the neutrino degeneracy parameter in the early Universe.

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9

LUKISHOVA, SVETLANA G. "NONLINEAR OPTICAL RESPONSE OF CYANOBIPHENYL LIQUID CRYSTALS TO HIGH-POWER, NANOSECOND LASER RADIATION." Journal of Nonlinear Optical Physics & Materials 09, no. 03 (September 2000): 365–411. http://dx.doi.org/10.1142/s0218863500000212.

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Results from investigations are summarized into: (1) transient refractive and absorptive (two-photon) nonlinearities at 0.532 μm by the Z-scan method, and (2) reflective nonlinearity in the near-IR, of linearly nonabsorbing cyanobiphenyl liquid crystals under nanosecond laser irradiation. (1) For isotropic liquid crystals at the several-nanosecond time scale and several tens-micrometers beam-waist-diameter, transient molecular-reorientation and thermal/density refractive nonlinearities compete in changing the sign of the total transient refractive nonlinearity. For the different, given pulse durations, the influence of coupled thermal and density effects on nonlinear refraction depends, through buildup time, on the beam-waist diameter. Nonlinear absorption coefficients depend on the incident intensity. For planar nematic layers, cumulative effects in heating (and in refractive nonlinearity) were observed even at low, 2–10 Hz pulse repetition rate. These results are useful for optical power limiting applications, and for intensity and beam-quality sensors of pulsed, high-power lasers. (2) Reflective nonlinearity of chiral-nematic (cholesteric) mirrors near selective reflection conditions for circular polarized light at λ=1.064 μm was studied both under free space irradiation and inside a laser resonator. Specially chosen experimental irradiation conditions make it possible to attribute the observed changing of reflectivity to athermal helix unwinding by the optical field. The results can find applications in laser-resonator mirrors, Q-switches and soft apertures for beam-profile formation, and also in showing the limits of use cholesteric optical elements in high-power laser beams.

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10

Xue, L., R. Reininger, Y. Q. Wu, Y. Zou, Z. M. Xu, Y. B. Shi, J. Dong, et al. "Design of an ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline." Journal of Synchrotron Radiation 21, no. 1 (December 11, 2013): 273–79. http://dx.doi.org/10.1107/s1600577513029093.

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A new ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline has been designed and is under construction at the Shanghai Synchrotron Radiation Facility. The beamline has two branches: one dedicated to angle-resolved photoemission spectroscopy (ARPES) and the other to photoelectron emission microscopy (PEEM). The two branches share the same plane-grating monochromator, which is equipped with four variable-line-spacing gratings and covers the 20–2000 eV energy range. Two elliptically polarized undulators are employed to provide photons with variable polarization, linear in every inclination and circular. The expected energy resolution is approximately 10 meV at 1000 eV with a flux of more than 3 × 1010 photons s−1at the ARPES sample positions. The refocusing of both branches is based on Kirkpatrick–Baez pairs. The expected spot sizes when using a 10 µm exit slit are 15 µm × 5 µm (horizontal × vertical FWHM) at the ARPES station and 10 µm × 5 µm (horizontal × vertical FWHM) at the PEEM station. The use of plane optical elements upstream of the exit slit, a variable-line-spacing grating and a pre-mirror in the monochromator that allows the influence of the thermal deformation to be eliminated are essential for achieving the ultrahigh-energy resolution.

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11

Kitamura, Hideo. "Production of circularly polarized synchrotron radiation." Synchrotron Radiation News 5, no. 1 (January 1992): 14–20. http://dx.doi.org/10.1080/08940889208602657.

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12

Vink, Jacco, Dmitry Prokhorov, Riccardo Ferrazzoli, Patrick Slane, Ping Zhou, Kazunori Asakura, Luca Baldini, et al. "X-Ray Polarization Detection of Cassiopeia A with IXPE." Astrophysical Journal 938, no. 1 (October 1, 2022): 40. http://dx.doi.org/10.3847/1538-4357/ac8b7b.

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Abstract We report on a ∼5σ detection of polarized 3–6 keV X-ray emission from the supernova remnant Cassiopeia A (Cas A) with the Imaging X-ray Polarimetry Explorer (IXPE). The overall polarization degree of 1.8% ± 0.3% is detected by summing over a large region, assuming circular symmetry for the polarization vectors. The measurements imply an average polarization degree for the synchrotron component of ∼2.5%, and close to 5% for the X-ray synchrotron-dominated forward shock region. These numbers are based on an assessment of the thermal and nonthermal radiation contributions, for which we used a detailed spatial-spectral model based on Chandra X-ray data. A pixel-by-pixel search for polarization provides a few tentative detections from discrete regions at the ∼ 3σ confidence level. Given the number of pixels, the significance is insufficient to claim a detection for individual pixels, but implies considerable turbulence on scales smaller than the angular resolution. Cas A’s X-ray continuum emission is dominated by synchrotron radiation from regions within ≲1017 cm of the forward and reverse shocks. We find that (i) the measured polarization angle corresponds to a radially oriented magnetic field, similar to what has been inferred from radio observations; (ii) the X-ray polarization degree is lower than in the radio band (∼5%). Since shock compression should impose a tangential magnetic-field structure, the IXPE results imply that magnetic fields are reoriented within ∼1017 cm of the shock. If the magnetic-field alignment is due to locally enhanced acceleration near quasi-parallel shocks, the preferred X-ray polarization angle suggests a size of 3 × 1016 cm for cells with radial magnetic fields.

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13

Goeke, J., J. Kessler, and G. F. Hanne. "Circularly polarized He radiation for electron polarimetry." Physical Review Letters 59, no. 13 (September 28, 1987): 1413–15. http://dx.doi.org/10.1103/physrevlett.59.1413.

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14

Bolotovskii, B. M., and A. V. Serov. "Transition radiation as a source of circularly polarized radiation." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 227, no. 1-2 (January 2005): 78–81. http://dx.doi.org/10.1016/j.nimb.2004.03.077.

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15

Prümper, G., O. Geßner, B. Zimmermann, J. Viefhaus, R. Hentges, H. Kleinpoppen, and U. Becker. "Absorption of circularly polarized VUV radiation in polarized iron vapour." Journal of Physics B: Atomic, Molecular and Optical Physics 34, no. 13 (June 25, 2001): 2707–14. http://dx.doi.org/10.1088/0953-4075/34/13/312.

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16

Maksimov, A. A., E. V. Filatov, and I. I. Tartakovskii. "A Semiconductor Injection Laser with Circularly Polarized Radiation." Bulletin of the Russian Academy of Sciences: Physics 85, no. 2 (February 2021): 176–79. http://dx.doi.org/10.3103/s1062873821020192.

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17

Potylitsyn, A. P., and D. A. Shkitov. "Circularly Polarized Component in the Smith–Purcell Radiation." Journal of Experimental and Theoretical Physics 133, no. 6 (December 2021): 649–57. http://dx.doi.org/10.1134/s1063776121120050.

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18

Ovsyanikov, V. V., and Ye D. Romanenko. "Radiation Characteristics of Circularly Polarized Dipole Antenna Arrays." Telecommunications and Radio Engineering 60, no. 1-2 (2003): 120–24. http://dx.doi.org/10.1615/telecomradeng.v60.i12.150.

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19

Shakeri, Soroush, and Alireza Allahyari. "Circularly polarized EM radiation from GW binary sources." Journal of Cosmology and Astroparticle Physics 2018, no. 11 (November 26, 2018): 042. http://dx.doi.org/10.1088/1475-7516/2018/11/042.

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20

Rza̧żewski, Kazimierz, and Bernard Piraux. "Circular Rydberg orbits in circularly polarized microwave radiation." Physical Review A 47, no. 3 (March 1, 1993): R1612—R1615. http://dx.doi.org/10.1103/physreva.47.r1612.

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21

Tanaka, T., and H. Kitamura. "A Novel Insertion Device for Circularly Polarized Radiation." Journal of Synchrotron Radiation 4, no. 4 (July 1, 1997): 193–98. http://dx.doi.org/10.1107/s0909049597001131.

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22

Neumann, Claus, Andrei Rogalev, José Goulon, Mik Lingham, and Eric Ziegler. "X-ray magnetic reflectometry using circularly polarized radiation." Journal of Synchrotron Radiation 5, no. 3 (May 1, 1998): 998–1000. http://dx.doi.org/10.1107/s0909049597016099.

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Magnetic reflectometry experiments have been performed in the X-ray range at the L 2,3 edges of rhodium. What makes these experiments original is the insertion of a very compact double-bounce reflectometer upstream of the monochromator. This configuration makes full use of the high polarization rate of the helical undulator source. This advantage is reflected in the high quality of the data obtained after only a few accumulations. It is also shown that, by properly selecting the angle of incidence, one may obtain experimental differential X-ray reflectivity spectra dominated either by the dispersion or the absorption terms.

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23

Ishikawa, Tetsuya. "X‐ray monochromators for circularly polarized incident radiation." Review of Scientific Instruments 60, no. 7 (July 1989): 2058–61. http://dx.doi.org/10.1063/1.1140825.

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24

Qian, Yahui, and Shumin Xie. "Wideband Circularly Polarized Filtering Hybrid Antenna." Applied Sciences 12, no. 21 (October 31, 2022): 11018. http://dx.doi.org/10.3390/app122111018.

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In this paper, a wideband circularly polarized (CP) filtering hybrid antenna is presented. The liquid dielectric resonator (DR) is excited by a microstrip-coupled cross-slot to generate CP radiation. Four inverted L-shaped strips are loaded on the ground plane to introduce an additional CP resonant point, then two adjacent axial ratio (AR) minima are combined to improve the bandwidth of the single-feed CP antenna. By etching a U-shaped slot and loading a C-shaped microstrip stub on the microstrip line, two tunable radiation nulls near the edges of the working band can be obtained without any extra filtering circuits. To verify the design, a filtering CP antenna is designed, fabricated, and tested. Measured results show that the antenna provides wider 3-dB AR and an impedance bandwidth of 38.8% from 1.36 to 2.02 GHz and 39.4% from 1.37 to 2.04 GHz, respectively. The realized gain of the proposed antenna is stable at about 7.8 dBi within the whole working band. A reasonable agreement between measured and simulated results is observed.

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25

Cheng, Yong, and Hui Liu. "A Novel Concentric Annular-Ring Slot Dual-Band Circularly Polarized Microstrip Antenna." International Journal of Antennas and Propagation 2018 (December 13, 2018): 1–8. http://dx.doi.org/10.1155/2018/7560567.

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A simple structure concentric annular-ring slot dual-band circularly polarized (CP) microstrip antenna operating at ISM band (2.45 GHz) and 5G band (3.5 GHz) is proposed in this paper. The antenna achieves dual-band operation by digging two concentric annular-ring slots on the ground. And on the angular positions with 45 degrees inclined of each annular slot, two bent structures are loaded to generate circularly polarized radiation. The radiation of this antenna is bidirectional, and the directions of rotation are opposite. The measured results of the annular-ring slot microstrip antenna show good performance of dual-band circularly polarized characteristics.

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26

Kawakami, Haruo, Masao Tanioka, and Ryoji Wakabayashi. "Circularly Polarized Log Periodic Dipole Antennas." Applied Computational Electromagnetics Society 35, no. 11 (February 4, 2021): 1312–13. http://dx.doi.org/10.47037/2020.aces.j.351125.

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This Modified Self-complementary LPDA [1] has a second array of dipoles so arranged that each dipole of the second array has a quarter-wavelength phase difference from that of the corresponding dipole of the standard LPDA array for the given radiation field. The cross-element LPDA does not need a broadband 90-degree hybrid junction to produce circular polarization.

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27

Guo, Min, Ji-Jun Yan, Shun-Shi Zhong, and Zhu Sun. "Wideband Circularly Polarized Dielectric Rod Antenna." International Journal of Antennas and Propagation 2012 (2012): 1–4. http://dx.doi.org/10.1155/2012/324197.

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A new dielectric rod antenna (DRA) is introduced to produce circular polarization (CP) over a wide frequency band without a complex feed network. Along with the simulated results, measured results of the antenna prototype are presented, showing a 3 dB axial ratio (AR) CP bandwidth of 17.7%. The radiation characteristics of the fabricated antenna are also demonstrated showing the measured gain of better than 6.2 dBi. Moreover, the measured impedance bandwidth (VSWR≤2) reaches 20.1%, from 8.75 GHz to 10.7 GHz, while the CP beamwidth (AR≤3 dB) at the central frequency is measured over 120°.

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28

Starke, K., A. P. Kaduwela, Y. Liu, P. D. Johnson, M. A. Van Hove, C. S. Fadley, V. Chakarian, E. E. Chaban, G. Meigs, and C. T. Chen. "Spin-polarized photoelectrons excited by circularly polarized radiation from a nonmagnetic solid." Physical Review B 53, no. 16 (April 15, 1996): R10544—R10547. http://dx.doi.org/10.1103/physrevb.53.r10544.

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29

Boeglin, C. "Spin-polarized electron emission from Fe(100) by circularly polarized synchrotron radiation." Journal of Magnetism and Magnetic Materials 121, no. 1-3 (March 1993): 130–33. http://dx.doi.org/10.1016/0304-8853(93)91166-5.

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30

Wu, Zhaoyang, Gang Xu, Wei Lu, Enyan Ding, and Jinqi Zhang. "A compact mesoband microwave radiation system." Review of Scientific Instruments 93, no. 11 (November 1, 2022): 114707. http://dx.doi.org/10.1063/5.0102328.

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A compact mesoband radiation system is designed and tested. The system is composed of a charging power supply, a Marx generator, a switched quarter-wavelength oscillator, and a circularly polarized patch antenna. The Marx generator outputs a fast high-voltage pulse with a rise time of 10 ns and an amplitude of 100 kV, which is used to charge the oscillator. The oscillator consists of a quarter-wavelength coaxial transmission line, a ring ground switch, and a coupler. It generates a mesoband oscillation pulse with a center frequency of 350 MHz and a percentage bandwidth of 10%. The oscillation pulse is radiated by the circularly polarized patch antenna. The measured radiation factor is greater than 50 kV, and the radiation waveform is consistent with the simulation waveform.

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31

Wang, Bo, Hang Wong, Di Wu, and Kwan L. Yeung. "Broadside circularly-polarized radiation generated by surface wave diffraction." Applied Physics Express 12, no. 9 (August 14, 2019): 095502. http://dx.doi.org/10.7567/1882-0786/ab389f.

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32

Hosseinmardi, Mahdi, Saeed Fallahzadeh, and Ahmad Cheldavi. "X-Band Circularly Polarized Saddle Radiation Pattern Satellite Antenna." Electromagnetics 35, no. 8 (November 11, 2015): 508–25. http://dx.doi.org/10.1080/02726343.2015.1101804.

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33

Irrgang, R., M. Drescher, F. Gierschner, M. Spieweck, and U. Heinzmann. "A laser light source for circularly polarized VUV radiation." Measurement Science and Technology 9, no. 3 (March 1, 1998): 422–27. http://dx.doi.org/10.1088/0957-0233/9/3/016.

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34

Narbudowicz, Adam, Xiulong Bao, Max Ammann, Hammam Shakhtour, and Dirk Heberling. "Circularly Polarized Antenna With Steerable Dipole-Like Radiation Pattern." IEEE Transactions on Antennas and Propagation 62, no. 2 (February 2014): 519–26. http://dx.doi.org/10.1109/tap.2013.2289323.

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35

Szymański, K., and L. Dobrzyński. "Waveform generator for monochromatic, circularly polarized Mössbauer γ-radiation." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 173, no. 3 (January 2001): 383–88. http://dx.doi.org/10.1016/s0168-583x(00)00386-4.

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36

Schmiedeskamp, B. "X-Ray Absorption and Experiments with Circularly Polarized Radiation." Acta Physica Polonica A 86, no. 5 (November 1994): 675–93. http://dx.doi.org/10.12693/aphyspola.86.675.

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37

Kfir, Ofer, Sergey Zayko, Christina Nolte, Murat Sivis, Marcel Möller, Birgit Hebler, Sri Sai Phani Kanth Arekapudi, et al. "Nanoscale magnetic imaging using circularly polarized high-harmonic radiation." Science Advances 3, no. 12 (December 2017): eaao4641. http://dx.doi.org/10.1126/sciadv.aao4641.

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38

Goulon, José, Pascal Elleaume, and Denis Raoux. "Special multipole wiggler design producing circularly polarized synchrotron radiation." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 254, no. 1 (February 1987): 192–201. http://dx.doi.org/10.1016/0168-9002(87)90502-x.

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39

Nedoluha, Gerald E., and William D. Watson. "Spectra of circularly polarized radiation from astrophysical OH masers." Astrophysical Journal 361 (October 1990): 653. http://dx.doi.org/10.1086/169228.

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40

Öğüt, E., G. Kızıltaş, and K. Şendur. "Circularly polarized localized near-field radiation at the nanoscale." Applied Physics B 99, no. 1-2 (November 14, 2009): 67–74. http://dx.doi.org/10.1007/s00340-009-3817-0.

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41

Meierhenrich, Uwe J, Jean-Jacques Filippi, Cornelia Meinert, Søren V Hoffmann, Jan Hendrik Bredehöft, and Laurent Nahon. "Photolysis of rac-Leucine with Circularly Polarized Synchrotron Radiation." Chemistry & Biodiversity 7, no. 6 (June 16, 2010): 1651–59. http://dx.doi.org/10.1002/cbdv.200900311.

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42

Wang, Chien-Jen, and Chia-Hsien Lin. "A CIRCULARLY POLARIZED QUASI-LOOP ANTENNA." Progress In Electromagnetics Research 84 (2008): 333–48. http://dx.doi.org/10.2528/pier08081002.

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Kumar, Arun, Santanu Dwari, Ganga Prasad Pandey, Binod Kumar Kanaujia, and Dinesh Kumar Singh. "A high gain wideband circularly polarized microstrip antenna." International Journal of Microwave and Wireless Technologies 12, no. 7 (February 4, 2020): 678–87. http://dx.doi.org/10.1017/s1759078719001612.

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AbstractIn this paper, a high gain wideband circularly polarized (CP) microstrip antenna is presented for broadband operation. The proposed structure comprised of a partially grounded printed monopole antenna loaded with a split ring resonator and a metallic reflector. By using the metallic reflector surface underneath the patch radiator results in the reflected waves in the same phase with main lobe radiation, thereby improving the gain and it also acts like a secondary radiator to generate wideband CP behavior in the proposed design. A gain enhancement of 4.3 dBi is achieved in the operating frequency band as compared with the design without a metallic reflector. The maximum gain achieved in the presented method is 8.6 dBic over the entire operating range. The proposed design shows a wideband behavior ranging from 4.30 to 9.10 GHz with the 10-dB impedance bandwidth of 71.64%. In addition, the proposed design yielded a broadside right hand CP radiation with a 3-dB axial ratio bandwidth of 33.88% from 4.98 to 7.01 GHz. The proposed antenna is fabricated and experimental results on reflection coefficient, gain, axial ratio, and radiation patterns concede well with simulation results.

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Kang, Chun-Ying, Shu Lin, Hua Zong, Zhi-Hua Zhao, and Xue-Ying Zhang. "A Wide-Band Circularly Polarized Wide-Gap Antenna Loaded with a Y-Shaped Metal Strip for L-Band Application." International Journal of Antennas and Propagation 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/194682.

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A wide-band circularly polarized wide-gap antenna loaded with a Y-shaped metal strip applied to L-band is proposed in this paper. The Y-shaped metal strip coupling motivates the wide gap to achieve wide-band circularly polarized radiation. Both the simulated results by CST Microwave Studio and the measured results indicate that the antenna impedance bandwidth (reflection coefficient less than −10 dB) and axial ratio bandwidth (AR < 3 dB) are 35.9% (1.1–1.71 GHz). The antenna produces a dual circularly polarized radiation with gain of 0.8–3.2 dBic. The equivalent current array model of the antenna is also presented, which well explains the radiation characteristics of the antenna. The introduction of the metal reflecting plate makes the antenna a directional one, whose gain is above 4 dBic within the band. This design enables the satellite communication for most frequency bands with high gain, which has a vast potential for future development.

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Kollipara, Vamshi, and Samineni Peddakrishna. "Circularly Polarized Antennas Using Characteristic Mode Analysis: A Review." Advances in Technology Innovation 7, no. 4 (March 8, 2022): 242–57. http://dx.doi.org/10.46604/aiti.2022.8739.

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Characteristic mode analysis (CMA) can be used in antenna designs to solve radiation problems. This review focuses on the existing development methodologies for circularly polarized (CP) antennas and their axial ratio bandwidth (ARBW) improvement using CMA. To discuss the physical insights related to CP radiation, this study systematically examines different antenna design structures used in previous research. It investigates the impact of modal parameters such as the eigenvalue, modal significance (MS), characteristic angle (CA), surface current, far-field radiation behavior on CP radiation, and ARBW for various antenna designs. In addition, it discusses the comparative analysis of various antenna design approaches in terms of antenna performance parameters such as the operating frequency band, ARBW, and gain. The results show that CMA provides more valuable information for the selection of feed position in antenna designs than the conventional full-wave simulation approach.

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Aqlan, Basem, Mohamed Himdi, Hamsakutty Vettikalladi, and Laurent Le-Coq. "Experimental Realization of Sub-THz Circularly Polarized Antenna Based on Metasurface Superstrate at 300 GHz." Materials 14, no. 17 (August 24, 2021): 4796. http://dx.doi.org/10.3390/ma14174796.

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This communication presents a low-profile fully metallic high gain circularly polarized resonant cavity antenna, with a novel single-layer metasurface as superstrate operating at 300 GHz. The unit cell of the metallic metasurface layer consists of perforated grids of hexagonal and octagonal-shaped radiating apertures. The metasurface superstrate layer acts as a polarization convertor from linear-to-circular, which provides left-handed circularly polarized (LHCP) radiation. For simplicity and less design difficulty, a low cost laser cutting brass technology is proposed to design the antenna at sub-terahertz. The proposed circularly polarized resonant cavity antenna prototype has a low-profile planar metallic structure of volume 2.6λ0×2.6λ0×1.24λ0. Experimental results validate the design concept. The antenna yields a measured LHCP gain of 16.2 dBic with a directivity of 16.7 dBic at 302 GHz. This proposed circularly polarized resonant cavity antenna finds potential application in 6G sub-terahertz wireless communications.

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Wu, Sifan, Jianxing Li, Yuanxi Cao, Sen Yan, Kaida Xu, and Hung Luyen. "Three-Dimensional Printed, Dual-Band, Dual-Circularly Polarized Antenna Array Using Gap Waveguide Technology." Applied Sciences 12, no. 21 (October 22, 2022): 10704. http://dx.doi.org/10.3390/app122110704.

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A gap waveguide (GW)-based 4 × 4 dual-band, dual-circularly polarized antenna array is proposed. The antenna is composed of two stacked layers which are responsible for right-handed circularly polarized (RHCP) radiation in K-band and left-handed circularly polarized (LHCP) radiation in Ka-band. Each stacked layer consists of a GW power distribution network to excite 16 radiating units from a single input. A waffle grid is mounted on top of the array structure to increase effective aperture areas and reduce grating lobes. A prototype was fabricated using stereo lithography appearance (SLA) 3D printing and metallization technology, which significantly decreased the fabrication cost and complexity. Measurement results for the antenna prototype demonstrate the operating bandwidths of 19.91–20.52 GHz in K-band and 28.26–29.19 GHz in Ka-band, over which the reflection coefficients of <−10 dB and axial ratios of <3 dB are achieved. The prototype provides peak gains of 20.1 and 20.3 dB with total efficiencies of >90% in the two respective bands. The combination of dual-band, dual-circularly polarized capability, high gain, high efficiency, lightweight, low cost and compact size renders the proposed design a potential candidate for commercial millimeter wave communication applications.

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Samsuzzaman, Md, and Mohammad Islam. "Circularly Polarized Broadband Printed Antenna for Wireless Applications." Sensors 18, no. 12 (December 4, 2018): 4261. http://dx.doi.org/10.3390/s18124261.

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A simple, compact sickle-shaped printed antenna with a slotted ground plane is designed and developed for broadband circularly polarized (CP) radiation. The sickle-shaped radiator with a tapered feed line and circular slotted square ground plane are utilized to realize the wideband CP radiation feature. With optimized dimensions of 0.29λ × 0.29λ × 0.012λ at 2.22 GHz frequency for the realized antenna parameters, the measured results display that the antenna has a 10 dB impedance bandwidth of 7.70 GHz (126.85%; 2.22–9.92 GHz) and a 3 dB axial ratio (AR) bandwidth of 2.64 GHz (73.33%; 2.28–4.92 GHz). The measurement agrees well with simulation, which proves an excellent circularly polarized property. For verification, the mechanism of band improvement and circular polarization are presented, and the parametric study is carried out. Since, the proposed antenna is a simple design structure with broad impedance and AR bandwidth, which is a desirable feature as a candidate for various wireless communication systems. Because of the easy printed structure and scaling the dimension with broadband CP characteristics, the realized antenna does incorporate in a number of CP wireless communication applications.

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Abdoula, Kawa. "Radiation Pattern of a Circularly Polarized Microstrip Short Backfire Antenna." Advances in Research 10, no. 3 (January 10, 2017): 1–9. http://dx.doi.org/10.9734/air/2017/34595.

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Zahid, Zeeshan, Longyue Qu, Hyung-Hoon Kim, and Hyeongdong Kim. "Circularly Polarized Loop-Type Ground Radiation Antenna for IoT Applications." Journal of Electromagnetic Engineering and Science 19, no. 3 (July 31, 2019): 153–58. http://dx.doi.org/10.26866/jees.2019.19.3.153.

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