Broadband Wide-Angle Incident Light Absorption by Metallic Loop Metasurfaces Based on Electro-Optic Substrate

2019 ◽  
Vol 31 (13) ◽  
pp. 1068-1071 ◽  
Author(s):  
Naseer Muhammad ◽  
Zhengbiao Ouyang ◽  
Xiaopin Tang ◽  
Qiang Liu
Keyword(s):  
Light Absorption ◽  
Incident Light ◽  
Wide Angle ◽  
Electro Optic

scholarly journals Electrical tuning of the polarization state of light using graphene-integrated anisotropic metasurfaces

2017 ◽  
Vol 375 (2090) ◽  
pp. 20160061 ◽  
Author(s):  
Shourya Dutta-Gupta ◽  
Nima Dabidian ◽  
Iskandar Kholmanov ◽  
Mikhail A. Belkin ◽  
Gennady Shvets
Keyword(s):  
Tilt Angle ◽  
Incident Light ◽  
Polarization State ◽  
Dynamic Control ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Dynamic Polarization ◽  
Reflected Light ◽  
Electro Optic ◽  
The Way

Plasmonic metasurfaces have been employed for moulding the flow of transmitted and reflected light, thereby enabling numerous applications that benefit from their ultra-thin sub-wavelength format. Their appeal is further enhanced by the incorporation of active electro-optic elements, paving the way for dynamic control of light's properties. In this paper, we realize a dynamic polarization state generator using a graphene-integrated anisotropic metasurface (GIAM) that converts the linear polarization of the incident light into an elliptical one. This is accomplished by using an anisotropic metasurface with two principal polarization axes, one of which possesses a Fano-type resonance. A gate-controlled single-layer graphene integrated with the metasurface was employed as an electro-optic element controlling the phase and intensity of light polarized along the resonant axis of the GIAM. When the incident light is polarized at an angle to the resonant axis of the metasurface, the ellipticity of the reflected light can be dynamically controlled by the application of a gate voltage. Thus accomplished dynamic polarization control is experimentally demonstrated and characterized by measuring the Stokes polarization parameters. Large changes of the ellipticity and the tilt angle of the polarization ellipse are observed. Our measurements show that the tilt angle can be changed from positive values through zero to negative values while keeping the ellipticity constant, potentially paving the way to rapid ellipsometry and other characterization techniques requiring fast polarization shifting. This article is part of the themed issue ‘New horizons for nanophotonics’.

How bubbles affect light absorption in photoelectrodes for solar water splitting?

2022 ◽  
Author(s):  
Abhinav Bhanawat ◽  
Keyong Zhu ◽  
Laurent Pilon
Keyword(s):  
Water Splitting ◽  
Light Absorption ◽  
Incident Light ◽  
Gas Bubbles ◽  
Photoelectrochemical Water Splitting ◽  
Solar Water ◽  
Solar Water Splitting

This paper aims to systematically investigate the effect of gas bubbles formation on the performance of a horizontal photoelectrode exposed to normally incident light during photoelectrochemical water splitting. The presence...

scholarly journals Electro-Optic Intensity Modulation in Fe-Doped KTa0.65Nb0.35O3 Crystals

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 870
Author(s):  
Cheng-Kai Yang ◽  
Xu-Ping Wang ◽  
Fei Zhang ◽  
Hua-Di Zhang ◽  
Bing Liu ◽  
...  
Keyword(s):  
Modulation Depth ◽  
Incident Light ◽  
Light Modulation ◽  
Light Power ◽  
Half Wave Voltage ◽  
Half Wave ◽  
Electro Optic ◽  
Ion Doping ◽  
Growth Method ◽  
Top Seeded Solution Growth

KTa0.65Nb0.35O3 and Fe-doped KTa0.65Nb0.35O3 crystals were grown by the top-seeded solution growth method (TSSG). Fe ion doping significantly improves the electro-optic properties of cubic KTN crystals. We describe their electro-optic modulation theory and experimental research. The electro-optic modulation waveform deduced by theoretical calculation is basically consistent with the waveform measured in the experiment. We observed the attenuation of light modulation under multiple voltage cycles. The modulation curve of the crystal is inconsistent when the crystal voltage is boosting and bucking. Under the same voltage condition, the higher the incident light power, the faster the modulation depth attenuation. In this experiment, the size of the KTN crystal chip is 6 mm × 5 mm × 2 mm. We obtain the effective electro-optic coefficient as s11 − s12 = 1.34 × 10−15 m2/V2; the half-wave voltage near the Curie temperature is 39 V.

New Wide Angle Electro-Optic Laser Scanners Enable Optical Sensors on Previously Inaccessible Platforms

2011 ◽  
Author(s):  
Scott R. Davis ◽  
Scott D. Rommel ◽  
Seth Johnson ◽  
George Farca ◽  
Neil Rebolledo ◽  
...  
Keyword(s):  
Optical Sensors ◽  
Wide Angle ◽  
Electro Optic ◽  
Laser Scanners

scholarly journals Wide-angle polarization-free plasmon-enhanced light absorption in perovskite films using silver nanowires

2017 ◽  
Vol 25 (4) ◽  
pp. 3594 ◽  
Author(s):  
Geng Wang ◽  
Ke Meng ◽  
Zhen He ◽  
Longlong Wu ◽  
Zhou Liu ◽  
...  
Keyword(s):  
Light Absorption ◽  
Silver Nanowires ◽  
Wide Angle

Study on Polarization Distribution of Polarization Encoder in Oblique Incidence

2011 ◽  
Vol 201-203 ◽  
pp. 1590-1595
Author(s):  
Mu Zhun Zhou ◽  
Yan Ru Chen ◽  
Qi Zhao ◽  
Yu Xin
Keyword(s):  
Theoretical Calculations ◽  
Incident Light ◽  
Polarization State ◽  
Polarized Light ◽  
Linbo3 Crystal ◽  
Polarization Distribution ◽  
Electro Optic ◽  
Measurement Results ◽  
Polarization Encoding ◽  
Elliptically Polarized

Principle of polarization encoding based on electro-optic effect of LiNbO3 crystal is analyzed, effact on polarization encoding optical field effects is studied when the incident light direction changes. Theoretical calculations show that, with the angle between the direction of incident laser beam and the main axis of LiNbO3 crystal increases, rotation angle of polarization ellipse remain unchanged,but ellipticity changes at any other position except in the center of the encoder,at the top and bottom of encoder,polarization state changes from circularly polarized to elliptically polarized,at other position of the encoder, polarization states are still elliptically polarized light but with different ellipticity angle. Experiment measurement results are in accord with ones of the calculation.

Analysis and Characterization of Surface Plasmon Enhancement of Light Absorption in Organic Solar Cells by the Transfer Matrix Method

2010 ◽  
Author(s):  
Francisco V. Rami´rez ◽  
Amador M. Guzma´n
Keyword(s):  
Solar Cells ◽  
Transfer Matrix ◽  
Organic Solar Cells ◽  
Transfer Matrix Method ◽  
Light Absorption ◽  
Matrix Method ◽  
Incident Light ◽  
Thick Layer ◽  
Physical Situation ◽  
Angle Of Incidence

Surface plasmons enhanced light absorption in organic solar cells based on a photoactive poly(2-methoxyl-5-(2-ethyl-hexyloxy)-1.4-phenylenevinylene):(6.6)-phenyl-C61-butyric-acid-methylester (MEH-PPV:PCBM), is studied by a computational model based on the transfer matrix method (TMM). Two physical situation with and without the bulk heterojunction film are considered and modeled on a 2D array of silver nanoparticles with a diameter of 40 nm embedded in a 50-nm-thick layer. The numerical simulation results that include optical properties in the wave length range of 350 and 750 nm, present qualitative and quantitative good agreement with previous results obtained by Duche et al (2009) in both conditions. Optical absorption results for incident light at an oblique angle of incidence are also obtained, with the purpose of determining the effect of the angle of incidence on the absorption properties.

scholarly journals Wide-Angle Beam-Steering Using an Optical Phased Array with Non-Uniform-Width Waveguide Radiators

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 56
Author(s):  
Youngin Kim ◽  
Hyeonho Yoon ◽  
Jong-Bum You ◽  
Minchul Kim ◽  
Hyo-Hoon Park
Keyword(s):  
Phased Array ◽  
Beam Steering ◽  
Side Lobe ◽  
Phase Shifters ◽  
Wide Angle ◽  
Half Wavelength ◽  
Electro Optic ◽  
Optical Phased Array ◽  
Diffraction Patterns ◽  
Silicon Based

We demonstrate wide-angle beam-steering using an optical phased array (OPA) with waveguide radiators designed with non-uniform widths to reduce the crosstalk between waveguides. The OPA consists of a silicon based 1 × 16 array of electro-optic phase shifters and end-fire radiators. The 16 radiators were configured with four different widths and a half-wavelength spacing, which can remove the higher-order diffraction patterns in free space. The waveguides showed a low crosstalk of −10.2 dB at a wavelength of 1540 nm. With phase control, the OPA achieved wide beam-steering of over ±80° with a side-lobe suppression of 7.4 dB.

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