Terahertz imaging: materials and methods

Hargreaves, Stuart; Lewis, R. A.

doi:10.1007/s10854-007-9220-x

Cited by 23 publications

(10 citation statements)

References 31 publications

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“…Among them there are Golay cells [31,32], pyroelectric detectors [33], different kind of thermal direct detection detectors (bolometers and microbolometers) [34,35], which use antennas to couple power to a small thermally absorbing regions. The NEP value for uncooled detectors typically is from 10 -10 to 10 -9 W/Hz 1/2 (see Table 3, Ref.…”

Section: Direct Detectionmentioning

confidence: 99%

Terahertz detectors and focal plane arrays

Rogalski

Сизов

2011

Opto-Electronics Review

322

225

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Terahertz (THz) technology is one of emerging technologies that will change our life. A lot of attractive applications in security, medicine, biology, astronomy, and non-destructive materials testing have been demonstrated already. However, the realization of THz emitters and receivers is a challenge because the frequencies are too high for conventional electronics and the photon energies are too small for classical optics. As a result, THz radiation is resistant to the techniques commonly employed in these well established neighbouring bands.In the paper, issues associated with the development and exploitation of THz radiation detectors and focal plane arrays are discussed. Historical impressive progress in THz detector sensitivity in a period of more than half century is analyzed. More attention is put on the basic physical phenomena and the recent progress in both direct and heterodyne detectors. After short description of general classification of THz detectors, more details concern Schottky barrier diodes, pair braking detectors, hot electron mixers and field-effect transistor detectors, where links between THz devices and modern technologies such as micromachining are underlined. Also, the operational conditions of THz detectors and their upper performance limits are reviewed. Finally, recent advances in novel nanoelectronic materials and technologies are described. It is expected that applications of nanoscale materials and devices will open the door for further performance improvement in THz detectors.

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Section: Direct Detectionmentioning

confidence: 99%

Terahertz detectors and focal plane arrays

Rogalski

Сизов

2011

Opto-Electronics Review

322

225

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“…Among such detectors are Golay cells employed, e.g., for THz imaging [38,39] and pyroelectric detectors (see, e.g., Ref. 40), different kind of thermal direct detection de− tectors (bolometers and microbolometers) [41,42], which use antennas to couple power to a small thermally absorbing regions.…”

Section: Direct Detection Detectorsmentioning

confidence: 99%

THz radiation sensors

Сизов

2010

Opto-Electronics Review

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In the paper, issues associated with the development and exploitation of terahertz (THz) radiation detectors are discussed. The paper is written for those readers who desire an analysis of the latest developments in different type of THz radiation sensors (detectors), which play an increasing role in different areas of human activity (e.g., security, biological, drugs and explosions detection, imaging, astronomy applications, etc.). The basic physical phenomena and the recent progress in both direct and heterodyne detectors are discussed. More details concern Schottky barrier diodes, pair braking detectors, hot electron mixers, and field-effect transistor detectors. Also the operational conditions of THz detectors and their upper performance limits are discussed.

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“…The main advantage in using heterodyne detection is that both the frequency and phase information are preserved. Where sensitivity is more important than spectral resolution, direct detection can also be used, including devices such as THz antennas [ 16 , 17 ] and thermal detectors, such as Golay cells [ 18 , 19 ], pyroelectric detectors [ 10 ] and bolometers [ 20 ]. The electro-optic effects induced in LiNbO 3 and other birefringent crystals are widely studied, and several detectors have already been developed [ 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

THz Pyro-Optical Detector Based on LiNbO3 Whispering Gallery Mode Microdisc Resonator

Cosci

Cerminara

Conti

et al. 2017

Sensors

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This study analyzes the capabilities of a LiNbO 3 whispering gallery mode microdisc resonator as a potential bolometer detector in the THz range. The resonator is theoretically characterized in the stationary regime by its thermo-optic and thermal coefficients. Considering a Q-factor of 10 7 , a minimum detectable power of 20 µW was evaluated, three orders of magnitude above its noise equivalent power. This value opens up the feasibility of exploiting LiNbO 3 disc resonators as sensitive room-temperature detectors in the THz range.

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Terahertz imaging: materials and methods

Cited by 23 publications

References 31 publications

Terahertz detectors and focal plane arrays

Terahertz detectors and focal plane arrays

THz radiation sensors

THz Pyro-Optical Detector Based on LiNbO3 Whispering Gallery Mode Microdisc Resonator

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