GaAs Linear Polarizer with a High Extinction Ratio for Extended Short-Wave Infrared Detection

Shi, Leidong; Lu, Lidan; Chen, Guang; Feng, Yulin; He, Yanlin; Ren, Guanghui; Ou, Jian Zhen; Zhu, Lianqing

doi:10.3390/photonics10050489

Cited by 2 publications

(2 citation statements)

References 25 publications

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“…An important point to note is that here, the extinction ratio of this design for metasurfaces can reach up to 45 dB. Compared to our previous metasurface design based on GaAs materials, there is a significant performance improvement [ 15 ].…”

Section: Numerical Simulation and Optimizationmentioning

confidence: 87%

“…Si has a band gap at 1.1 eV and a cut-off wavelength of around 1110 nm, which is far away from our operating wavelength; therefore, Si has low transmission loss at the ESWIR band. Hence, building upon this groundwork, we propose a novel silicon-based metasurface [ 15 ]. Thus, the design of polarizers based on Si with high extinction ratios (ER) that can be utilized in the ESWIR range is a crucial concern in practical applications [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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Si-Based Polarizer and 1-Bit Phase-Controlled Non-Polarizing Beam Splitter-Based Integrated Metasurface for Extended Shortwave Infrared

Shi,

Lu,

Chen

et al. 2023

Nanomaterials

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Metasurfaces, composed of micro-nano-structured planar materials, offer highly tunable control over incident light and find significant applications in imaging, navigation, and sensing. However, highly efficient polarization devices are scarce for the extended shortwave infrared (ESWIR) range (1.7~2.5 μm). This paper proposes and demonstrates a highly efficient all-dielectric diatomic metasurface composed of single-crystalline Si nanocylinders and nanocubes on SiO2. This metasurface can serve as a nanoscale linear polarizer for generating polarization-angle-controllable linearly polarized light. At the wavelength of 2172 nm, the maximum transmission efficiency, extinction ratio, and linear polarization degree can reach 93.43%, 45.06 dB, and 0.9973, respectively. Moreover, a nonpolarizing beam splitter (NPBS) was designed and deduced theoretically based on this polarizer, which can achieve a splitting angle of ±13.18° and a phase difference of π. This beam splitter can be equivalently represented as an integration of a linear polarizer with controllable polarization angles and an NPBS with one-bit phase modulation. It is envisaged that through further design optimization, the phase tuning range of the metasurface can be expanded, allowing for the extension of the operational wavelength into the mid-wave infrared range, and the splitting angle is adjustable. Moreover, it can be utilized for integrated polarization detectors and be a potential application for optical digital encoding metasurfaces.

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Section: Numerical Simulation and Optimizationmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Si-Based Polarizer and 1-Bit Phase-Controlled Non-Polarizing Beam Splitter-Based Integrated Metasurface for Extended Shortwave Infrared

Shi,

Lu,

Chen

et al. 2023

Nanomaterials

Self Cite

View full text Add to dashboard Cite

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Design and simulated characterization of the dual-band polarizer based on metasurface structure

Zhu,

He,

Wang

et al. 2024

AIP Advances

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Dual-band polarizers must simultaneously exhibit high transmittance and bandwidth efficiency in fields such as polarization navigation and efficient detection. However, in most studies, the detection of dual bands is inefficient. To address this issue, we designed a dual-band polarizer similar in structure to the Roman numeral II, and it allows transmission of two different linear polarizations within different frequency bands. The interaction of the dual-band nano-polarizer with the polarization state of the incident light was analyzed through simulation experiments on the material, height, duty cycle, and other parameters of the periodic structure of the polarizer unit. The simulation results show that the proposed dual-band polarizer could achieve a polarization degree above 0.75 in the visible range and above 0.8 in the near-infrared (NIR) range. In addition, the transmittance was above 80% for x-polarization light in most of the visible wavelengths and reached 97.7% for y-polarization light in the NIR region, where NIR bandwidth accounted for 83.3% of the NIR wavelengths. The proposed design can achieve high transmittance and can be applied to ultrawide single-band polarization detection or dual-band vertical polarization detection.

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GaAs Linear Polarizer with a High Extinction Ratio for Extended Short-Wave Infrared Detection

Cited by 2 publications

References 25 publications

Si-Based Polarizer and 1-Bit Phase-Controlled Non-Polarizing Beam Splitter-Based Integrated Metasurface for Extended Shortwave Infrared

Si-Based Polarizer and 1-Bit Phase-Controlled Non-Polarizing Beam Splitter-Based Integrated Metasurface for Extended Shortwave Infrared

Design and simulated characterization of the dual-band polarizer based on metasurface structure

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