Exploration on precision farming pollution detection using THz technology

Bin, 李斌 Li; Liping, 陈立平 Chen

doi:10.3788/irla201645.0425003

Cited by 2 publications

(1 citation statement)

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“…While substantial research has been concentrated on integrated circular-polarization detectors in the visible-to-mid-infrared range, the THz band remains relatively underexplored. The THz band, noted for its low photon energy [24,25], robust penetration capabilities [26,27], expansive communication bandwidth [28,29], and superior spatial and temporal resolution [30][31][32] compared to microwaves, holds significant potential for advancing imaging, spectroscopy, and wireless communication [33]. Thus, the development of miniaturized THz circular-polarization detectors, which addresses the challenges posed by bulky non-integrated detectors and the scarcity of suitable polarization optics in the THz range, is not only of great significance but also imminent.…”

Section: Introductionmentioning

confidence: 99%

Enhanced THz Circular-Polarization Detection in Miniaturized Chips with Chiral Antennas

Li,

Zhou,

Deng

et al. 2024

Photonics

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Recent advancements in terahertz (THz) wave technology have highlighted the criticality of circular-polarization detection, fostering the development of more compact, efficient on-chip THz circular-polarization detectors. In response to this technological imperative, we presented a chiral-antenna-integrated GaAs/AlGaAs quantum well (QW) THz detector. The chiral antenna selectively couples the incident light of a specific circular-polarization state into a surface-plasmon polariton wave that enhances the absorptance of the QWs by a factor of 12 relative to a standard 45° faceted device, and reflects a significant amount of the incident light of the orthogonal circular-polarization state. The circular-polarization selectivity is further enhanced by the QWs with a strong intrinsic anisotropy, resulting in a circular-polarization extinction ratio (CPER) as high as 26 at 6.52 THz. In addition, the operation band of the device can be adjusted by tuning the structural parameters of the chiral structure. Moreover, the device preserves a high performance for oblique incidence within a range of ±5°, and the device architecture is compatible with a focal plane array. This report communicates a promising approach for the development of miniaturized on-chip THz circular-polarization detectors.

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Section: Introductionmentioning

confidence: 99%

Enhanced THz Circular-Polarization Detection in Miniaturized Chips with Chiral Antennas

Li,

Zhou,

Deng

et al. 2024

Photonics

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Compact on-chip THz circular polarization detectors with high discrimination based on chiral plasmonic antennas

Li,

Chu,

Zhou

et al. 2023

Opt. Mater. Express

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THz circular polarization detection is an important technology in many applications of THz waves. With the ongoing miniaturization of optoelectronic systems, there is an increasing demand for compact on-chip THz circular polarization detectors. Here, we propose what we belive to be a novel device of this kind based on the composite structure of quantum well (QW) infrared detection material sandwiched by a chiral plasmonic antenna array and a metal plane. Due to the circular polarization dependent light coupling discrimination provided by the cavity enhanced chiral antenna and the second polarization selection of the QWs, a circular polarization extinction ratio as high as 25 is achieved, surpassing all reported on-chip THz circular polarization detectors. Due to the field enhancement at the QWs, the absorption for the principle circular polarization is 15 times higher than a standard reference. The absorption peak can be tuned over the range from 6.41 to 6.56 THz, while considerable absorption enhancement and high circular polarization discrimination are preserved even under non-normal incidence. Our proposed device's structure is compatible with the QWIP focal plane array and has far-reaching application prospects opens a new avenue to the development of high-performance compact on-chip THz circular polarization detectors.

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Exploration on precision farming pollution detection using THz technology

Cited by 2 publications

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Enhanced THz Circular-Polarization Detection in Miniaturized Chips with Chiral Antennas

Enhanced THz Circular-Polarization Detection in Miniaturized Chips with Chiral Antennas

Compact on-chip THz circular polarization detectors with high discrimination based on chiral plasmonic antennas

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