A tunable ultra-broadband linear-to-circular polarization converter containing the graphene

Zeng, Li; Huang, Tong; Liu, Guo‐Biao; Zhang, Haifeng

doi:10.1016/j.optcom.2018.11.079

Cited by 33 publications

(10 citation statements)

References 26 publications

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“…It is important to note that if the Fermi energy is too high for the experiment, the substrate might be destroyed. In this study, we have determined the Fermi energy of graphene based on previous studies with numerical simulations [32][33][34], thus confirming its theoretical performance. To investigate the effect of changes in the electron mobility of graphene ture, the emission spectra at several electron mobilities were calculated, as s ure 7a.…”

Section: Resultssupporting

confidence: 74%

Theoretical and Numerical Analysis of Active Switching for Narrow-Band Thermal Emission with Graphene Ribbon Metasurface

Yada

Shimojo

Okada

et al. 2021

Sensors

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Components smaller than the wavelength of electromagnetic waves are called meta-atoms. Thermal emission can be controlled by an artificial structure in which these meta-atoms are arranged on the surface. This artificial structure is called a metasurface, and its optical properties are determined by the materials and shapes of the meta-atoms. However, optical devices may require active control of thermal emission. In the present study, we theoretically and numerically analyze a wavelength-selective emitter using a graphene ribbon metasurface. The graphene ribbon metasurface consists of a graphene ribbon array, potassium bromide thin film, and silver substrate. The geometric parameters of the graphene metasurface are determined based on an equivalent circuit model that agrees well with the results of the electromagnetic field analysis (rigorous coupled-wave analysis). The proposed emitter causes impedance matching depending on the conductivity of the graphene ribbon in a very narrow wavelength range. The conductivity of graphene can be actively controlled by the gate voltage. Therefore, the proposed emitters may realize near-perfect emission with a high quality factor and active controllable switching for various wavelengths. In addition, the quality factor can be changed by adjusting the electron mobility of graphene. The proposed emitter can be used for optical devices such as thermophotovoltaic systems and biosensing.

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Section: Resultssupporting

confidence: 74%

Theoretical and Numerical Analysis of Active Switching for Narrow-Band Thermal Emission with Graphene Ribbon Metasurface

Yada

Shimojo

Okada

et al. 2021

Sensors

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“…The graphene's conductivity can be managed by various parameters such as temperature, duration, dispersion rate, and chemical potential [58]. Several devices are suggested for complete absorption [59,[61][62][63] polarization-insensitive [64][65][66][67], broad-angle [64][65][66][67][68], tunability [69][70][71][72]. For the Terahertz area and the Microwave, others are examined.…”

Section: Graphene-based Metamaterialsmentioning

confidence: 99%

Graphene-Based Nanophotonic Devices

Pandya¹,

Sorathiya²,

Lavadiya³

2020

Recent Advances in Nanophotonics - Fundamentals and Applications

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Graphene is an ideal 2D material that breaks the fundamental properties of size and speed limits by photonics and electronics, respectively. Graphene is also an ideal material for bridging electronic and photonic devices. Graphene offers several functions of modulation, emission, signal transmission, and detection of wideband and short band infrared frequency spectrum. Graphene has improved human life in multiple ways of low-cost display devices and touchscreen structures, energy harvesting devices (solar cells), optical communication components (modulator, polarizer, detector, laser generation). There is numerous literature is available on graphene synthesis, properties, devices, and applications. However, the main interest among the scientist, researchers, and students to start with the numerical and computational process for the graphene-based nanophotonic devices. This chapter also includes the examples of graphene applications in optoelectronics devices, P-N junction diodes, photodiode structure which are fundamental devices for the solar cell and the optical modulation.

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“…Therefore, graphene-based PCM is expected to achieve good tunability [ 19 , 20 , 21 ]. However, graphene PCM [ 22 , 23 , 24 ] has single polarization properties, which is still limited in functionality. One promising way is to combine antenna with graphene PCM to expand the polarization conversion functionality, which is expected to enable tunable linear polarization and circular polarization characteristics at the same working frequency band.…”

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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A tunable ultra-broadband linear-to-circular polarization converter containing the graphene

Cited by 33 publications

References 26 publications

Theoretical and Numerical Analysis of Active Switching for Narrow-Band Thermal Emission with Graphene Ribbon Metasurface

Theoretical and Numerical Analysis of Active Switching for Narrow-Band Thermal Emission with Graphene Ribbon Metasurface

Graphene-Based Nanophotonic Devices

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

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