Extremely Short Length and High Extinction Ratio Plasmonic TE Mode Pass Polarizer

Sharma, V.K.; Madaan, Divya; Kapoor, Avinashi

doi:10.1109/lpt.2017.2662707

Cited by 15 publications

(8 citation statements)

References 14 publications

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“…The input waveguide provides power to the photodetector section which excites the two modes supported by it. The absorption losses, in dB, in the detecting section can be expressed as [19]…”

Section: Proposed Structure and Optimizationmentioning

confidence: 99%

Highly efficient resonant length integrated optic photodetector

Sharma¹

2022

Eng. Res. Express

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A novel integrated optic photodetector with resonant length is theoretically proposed for detection at 1.55 μm. The structure consists of substrate/ waveguide/ phase matching layer (low index)/ absorbing semiconductor layer /air. A general mode expansion and propagation technique based on supermode analysis is used to study the propagation of modes in the device structure. Periodic coupling between the guided mode and the modes supported by the absorbing layer takes place and varies with the length of the detector. We show that resonant coupling between the two super modes takes place for the optimized thickness of the phase matching layer and the absorbing layer at a particular length of the detector which is considered the detector length. An attenuation exceeding 170 dB could be obtained for a detector length of 13 μm for TM polarization. The proposed photodetector exhibits a 3dB bandwidth exceeding 300 GHz and has capacitance of only 0.01 pF. Similar results have been obtained for TE polarization with different thickness of the absorbing layer.

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Section: Proposed Structure and Optimizationmentioning

confidence: 99%

Highly efficient resonant length integrated optic photodetector

Sharma¹

2022

Eng. Res. Express

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“…Manipulating the polarization states is of central interest in various fields, and the ability of which enables us to control electromagnetic (EM) waves for a wide range of applications due to the fact that many phenomena are inherently polarization-sensitive like sensors [1] and imaging [2]. According to the combination of different amplitude and phase, the polarized waves can be classified into the linear wave, circular wave, and elliptical wave among which circular polarization wave, as output wave of linear-to-circular polarization converter (LTCPC) [3], particularly offers an approach in the antennas [4], satellites [5], and liquid crystal displays [6].…”

Section: Introduction mentioning

confidence: 99%

Linear-to-Circular Polarization Converter with Adjustable Bandwidth Realized by the Graphene Transmissive Metasurface

Zhang

Zhao

et al. 2022

Plasmonics

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A tunable linear-to-circular polarization converter (LTCPC) for the terahertz (THz) regime which consists of two conductive layers and a graphene transmissive metasurface layer separated by two dielectric layers is reported in this work. The equivalent surface resistance modeling method is adopted to investigate the peculiar electronic properties of graphene. The simulation results show that when the Fermi energy (E f ) is 1.1 eV, the linearly-polarized wave can be transformed into the circularly-polarized wave in the working band ranging from 0.9498 THz to 1.3827 THz (the relative bandwidth is 37.1%) with axial ratio (AR) less than 3 dB. Moreover, the bandwidth can be regulated to the desired one by varying the Fermi level of graphene metasurface via a bias voltage rather than manually modifying the structure. We have analyzed the mechanism of the polarization conversion, especially, the magnitudes and the phase difference of cross-and co-polarization transmission coefficients, AR curves, and surface current diagrams at y-polarized incidence. Our findings open up promising possibilities towards the realization of graphene controllable devices for polarization modulation, which has advantages of adjustability over traditional devices.

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“…Meta-material (MM) and meta-surfaces (MS) have more lightweight structures and better performances. For these reasons, MMs have been widely used in micro-nano devices including sensors [ 6 ], absorbers [ 7 , 8 ], and antennas [ 9 , 10 ]. Similarly, MMs and MS have been widely used as a new method for changing the polarization state, such as linear-circular [ 11 ], linear-linear [ 12 ], and circular -circular [ 13 ] converters.…”

Section: Introductionmentioning

confidence: 99%

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

et al. 2021

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A hybrid dual-frequency polarized reconfigurable terahertz antenna is designed and studied. Graphene and TOPAS are employed as the polarization conversion metasurface and dielectric substrate, respectively, enabling tunable polarization conversion and circular polarization. TOPAS is a good substrate material for broadband THz components due to its low absorption. By adjusting the chemical potential of graphene between 0 eV and 0.5 eV, the polarization state in the band of 1 THz (0.76–1.02 THz) and 2.5 THz (2.43–2.6 THz) can be reconstructed. Thanks to the multilayer graphene structure and low absorption TOPAS, the graphene metasurface exhibits a broad bandwidth of 0.26 and 0.17 THz, respectively, in the band of 1 THz and 2.5 THz. The working state of the circularly polarized antenna and linearly polarized antenna can be switched in the bands around 1 THz (0.7–0.75 THz, 0.96–1.04 THz) and 2.5 THz (2.42–2.52 THz), respectively, without changing the physical geometry. Moreover, the graphene antenna, metasurface, and hybrid structure are tested, respectively, to verify that the components do not interfere with each other in performance. The hybrid antenna shows great potential in tunable terahertz devices and related applications.

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Extremely Short Length and High Extinction Ratio Plasmonic TE Mode Pass Polarizer

Cited by 15 publications

References 14 publications

Highly efficient resonant length integrated optic photodetector

Highly efficient resonant length integrated optic photodetector

Linear-to-Circular Polarization Converter with Adjustable Bandwidth Realized by the Graphene Transmissive Metasurface

Dual-Frequency Polarized Reconfigurable Terahertz Antenna Based on Graphene Metasurface and TOPAS

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