Designing a Broadband Terahertz Half-Wave Plate Using an Anisotropic Metasurface

Gandhi, Chaitanya; Babu, P. Ramesh; Senthilnathan, K.

doi:10.1007/s10762-019-00575-3

Cited by 16 publications

(3 citation statements)

References 37 publications

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“…At present, the application of metamaterials to the development of various functional devices is a key research direction in materials field, such as modulator, antenna, half-wave plate, etc. [38][39][40] One important research direction is metamaterial sensor, [41][42][43][44][45][46][47] as shown in Table 2. Over the past decade, numerous novel metamaterial sensors have been proposed and validated.…”

Section: Liquid Sensingmentioning

confidence: 99%

Optimized absorption performance of a terahertz single mode metamaterial for gas and liquid detection

2023

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Metamaterial absorbers are widely used in the sensing field based on their rich resonance behaviors. So far, the applications of metamaterial absorbers in gas sensing have not been paid much attention by researchers. A single-mode narrow bandwidth THz metamaterial absorber is suggested and validated. An absorption peak is excited based on local surface polarization mode resonance and dielectric loss in the 2 to 36 THz band. In experiments, the hole array diameter R is increased, the absorption peak is increased from 0.51 to 0.66, and resonance position is moved to the high-frequency region. When the dielectric layer thickness h 2 is increased, the absorption peak is increased from 0.51 to 0.57, and resonance position is moved to the low-frequency region. Similarly, when the dielectric layer thickness h 3 is increased, the absorption peak is increased from 0.51 to 0.53, and resonance position is also moved to the low-frequency region. This metamaterial absorber exhibits the feasible for gas and liquid sensing.

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Section: Liquid Sensingmentioning

confidence: 99%

Optimized absorption performance of a terahertz single mode metamaterial for gas and liquid detection

2023

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“…More advanced metamaterial approaches have also demonstrated good broadband performance. [23][24][25] The grating suite is used in point-and-chop mode for deep observations of individual objects. Here the observatory field steering mirror (FSM) modulates the image of a point source between two positions on the slit.…”

Section: Scientific Motivation For Far-ir Spectroscopymentioning

confidence: 99%

Origins Survey Spectrometer: revealing the hearts of distant galaxies and forming planetary systems with far-IR spectroscopy

Bradford

Cameron

Moore

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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The Origins Survey Spectrometer (OSS) is a multipurpose far-IR spectrograph for Origins. Operating at the photon background limit, OSS covers the 25-to 588-μm wavelength range instantaneously at a resolving power (R) of 300 using six logarithmically spaced grating modules. Each module couples at least 30 and up to 100 spatial beams simultaneously, enabling true [three-dimensional (3D)] spectral mapping. In addition, OSS provides two high-resolution modes. The first inserts a long-path Fourier-transform spectrometer (FTS) into a portion of the incoming light in advance of the grating backends, enabling R up to 43; 000 × ½λ∕112 μm, while preserving the grating-based sensitivity for line detection. The second incorporates a scanning etalon in series with the FTS to provide R up to 300,000 for the 100-to 200-μm range.

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“…Conventional polarization converter based on metasurface is composed of periodically placed unit cells [14][15][16][17], and its propagation follows the Snell's law. The polarization conversion ratio (PCR) of conventional reflective polarization convertors based on metasurface would sharply decrease with the increase of the incident angle, so its potential application prospects are limited [18,19].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Off-Axis Focus Polarization Converter Based on Metasurface

Yin¹,

Zhu²,

Ma³

2021

PIER Letters

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In order to satisfy the requirements of terahertz time-domain spectrum system under specific circumstances, an off-axis focus reflective polarization converter in terahertz band is proposed. By combining the principle of phase compensation and phase gradient metasurface, a reflective array containing 20 × 20 units is designed. The phase distribution along the metasurface is calculated through the principle of optical path reversibility. Geometric rotation and resonant frequency modulation constitute the phase change of the unit that can overlap one another without interference. Compared with the conventional reflective polarization converter in terahertz band, the proposed one could reflect the normally incident terahertz wave while providing larger energy at the focus. The simulation results show that the proposed polarization converter has good performance in both polarization conversion and electromagnetic focus, which has significant practical application in numerous situations.

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Designing a Broadband Terahertz Half-Wave Plate Using an Anisotropic Metasurface

Cited by 16 publications

References 37 publications

Optimized absorption performance of a terahertz single mode metamaterial for gas and liquid detection

Optimized absorption performance of a terahertz single mode metamaterial for gas and liquid detection

Origins Survey Spectrometer: revealing the hearts of distant galaxies and forming planetary systems with far-IR spectroscopy

Terahertz Off-Axis Focus Polarization Converter Based on Metasurface

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