Reflective grating-coupled structure improves the detection efficiency of THz array detectors

Xiao, Peng; Tu, Xuecou; Kang, Lin; Jiang, Chengtao; Zhai, Shimin; Jiang, Zhou; Pan, Danfeng; Chen, Jian; Jia, Xiaoqing

doi:10.1038/s41598-018-26204-y

Cited by 8 publications

(4 citation statements)

References 19 publications

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“…Слід до того ж додати, що розрідження спектра в зазначених ВР обмежується лише селекцією по поперечних типах коливань. Здійснити розрідження спектра коливальної системи одночасно по поперечним і по поздовжніх індексах, а також наблизитися до межі одночастотного режиму збудження коливань, як виявилося, можна в ВР, дзеркала яких мають кутову дисперсією [6,7].…”

Section: вступunclassified

Quasioptical Solid-State Generator With Open Quasi-Frequency Sphereoseletal Oscillating System

Ольховський¹,

Fursov²

2021

Вісник НТУ "ХПІ"

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The results of research related to the development of an effective high-Q open oscillatory system of quasi-optical solid-state generators of millimeter and submillimeter wavelength ranges are presented. It is shown that for the stable operation of solid-state generators based on Gunn diodes and avalanche-transit diodes (ATDs) located inside an open resonator (OR), a significant rarefaction of the resonance frequency spectrum is required, which excludes jumps of the generation frequency. Taking this requirement into account, a spheroechelett open resonator (SE OR) is proposed as an open oscillatory system of solid-state generators, one of the mirrors of which is a reflective lattice of the “echelette” type. The paper presents the results of “cold” measurements of the spectrum of resonance frequencies of the SE OP, which indicate that the SE OP indeed has a significantly rarefied spectrum both in transverse and, which is very important, in longitudinal modes of oscillations. The conditions necessary for the excitation of high-quality stable oscillations with high energy efficiency in a solid-state generator based on an SE OR are discussed and implemented. The results of an experimental study of a quasi-optical generator based on an 8-mm ATD wavelength range are presented. The analysis of the obtained characteristics and their qualitative explanation on the basis of the proposed model of the processes occurring in the investigated generator are presented. It is shown that the SE OR can be used as a resonant system in the entire EHF range of not only solid-state, but also electronic-vacuum devices. Finally, a way is outlined in the direction of further rarefaction of the spectrum of the SE OR in order to create a really single-frequency open oscillatory system.

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Section: вступunclassified

Quasioptical Solid-State Generator With Open Quasi-Frequency Sphereoseletal Oscillating System

Ольховський¹,

Fursov²

2021

Вісник НТУ "ХПІ"

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“…Bolometers, pyroelectrics, and thermopiles are among the most used thermal detectors. Some notable methods to improve the moderate responsivity of thermal detectors are the membrane-suspended bolometer structure to reduce thermal conduction [ 12 , 13 , 14 , 15 ], a novel THz antenna-coupled bolometer to optimize THz wave collection [ 16 , 17 ], an optical focusing lens [ 18 , 19 ], a metal grating absorber structure [ 20 , 21 , 22 ], and utilization of a highly sensitive thin film material [ 23 , 24 ]. Further performance enhancement is still widely possible by enabling state-of-the-art fabrication and measurement technologies.…”

Section: Introductionmentioning

confidence: 99%

Responsivity and NEP Improvement of Terahertz Microbolometer by High-Impedance Antenna

Aji

Satoh

Apriono

et al. 2022

Sensors

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The antenna-coupled microbolometer with suspended titanium heater and thermistor was attractive as a terahertz (THz) detector due to its structural simplicity and low noise levels. In this study, we attempted to improve the responsivity and noise-equivalent power (NEP) of the THz detector by using high-resistance heater stacked on the meander thermistor. A wide range of heater resistances were prepared by changing the heater width and thickness. It was revealed that the electrical responsivity and NEP could be improved by increasing the heater’s resistance. To make the best use of this improvement, a high-impedance folded dipole antenna was introduced, and the optical performance at 1 THz was found to be better than that of the conventional halfwave dipole antenna combined with a low-resistance heater. Both the electrical and optical measurement results indicated that the increase in heater resistance could reduce the thermal conductance in the detector, thus improved the responsivity and NEP even if the thermistor resistance was kept the same.

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“…Usually, the responsivity of PDs in the THz range is improved by: (i) a traditional gate structure with the grating-gate structure [28]; (ii) implementation of a silicon lens [29], diffractive grating [30], or wavelength-scaled dielectric cube [31,32]; and (iii) internal integration of an antenna structure [33,34]. All these methods, except for [31,32], require a change in the internal structure of the THz detector and its design and are intended for special operation in the THz range.…”

Section: Introductionmentioning

confidence: 99%

Improvement of an InfraRed Pyroelectric Detector Performances in THz Range Using the Terajet Effect

et al. 2021

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An infrared (IR) pyroelectric detector was investigated for terahertz (THz) detection using the principle of the terajet effect, which focuses the beam beyond the diffraction limit. The terahertz beam was coupled to the detector’s optical window through a two-wavelength-dimension dielectric cubic particle-lens based on the terajet effect. We experimentally demonstrate an enhancement of about 6 dB in the sensitivity under excitation of 0.2 THz without degradation of the noise equivalent power value. The results show that the proposed method could be applied to increase the sensitivity of various commercial IR sensors for THz applications that do not require modification of the internal structure, and it may apply also to acoustics and plasmonic detectors.

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Reflective grating-coupled structure improves the detection efficiency of THz array detectors

Cited by 8 publications

References 19 publications

Quasioptical Solid-State Generator With Open Quasi-Frequency Sphereoseletal Oscillating System

Quasioptical Solid-State Generator With Open Quasi-Frequency Sphereoseletal Oscillating System

Responsivity and NEP Improvement of Terahertz Microbolometer by High-Impedance Antenna

Improvement of an InfraRed Pyroelectric Detector Performances in THz Range Using the Terajet Effect

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