Plasmonic Helicity‐Driven Detector of Terahertz Radiation

Gorbenko, Ilya V.; Kachorovskii, V. Yu.; Shur, M. S.

doi:10.1002/pssr.201800464

Cited by 9 publications

(9 citation statements)

References 56 publications

(221 reference statements)

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“…To enhance the quantum efficiency of the THz photoconductive antenna, and hence the photon density of the THz beam, innovative architectures to improve the design of the photoconductive antennas were proposed and fabricated. 157,159 In the following sections, some of these devices are reviewed.…”

Section: Advances In Terms Of Terahertz Devicesmentioning

confidence: 99%

Survey of terahertz photonics and biophotonics

et al. 2020

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We review the advances of terahertz (THz) science and technology in biophotonics, including related challenges and solutions. The main impediment to THz spectroscopy and imaging in this field is the high absorption of the THz beam in water. Hence, transmission imaging and spectroscopy of thick wet tissue using THz radiation has generally been quite difficult. However, the absorption of THz waves by water molecules is so strong that increasing the power of the THz source can lead to structural and functional changes in tissues, so solutions must go beyond a larger power output. In terms of resolution, THz imaging is superior to ultrasound but inferior to visible light microscopy. Owing to its unique material analysis capabilities, promising diagnosis applications have been demonstrated through THz imaging and spectroscopy. Unfortunately, many applications are limited by beam penetration depth and resolution. Hence, researchers from a wide variety of scientific and technical fields have been actively improving these features through the development of electronic devices and materials. In addition, groundbreaking optical architecture and materials to reduce beam absorption in the optics of a system and generate focused beams with smaller diameters have been proposed. On the software side, image processing techniques to computationally enhance the resolution and quality of THz imaging have been proposed. Data science and machine learning to automate the diagnosis of defects and diseases through processing THz images and spectroscopy data have been proposed. We have reviewed the applications of THz radiation in biophotonics and research achievements toward advancing these applications. A conclusion with a roadmap toward increasing the footprint of the THz technology in biophotonics is also proposed.

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Section: Advances In Terms Of Terahertz Devicesmentioning

confidence: 99%

Survey of terahertz photonics and biophotonics

et al. 2020

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“…(3)(4)(5) with the boundary conditions given by Eq. (2) is obtained using the same approach as in [2,12] ω ω γ ω ω γ ω ω…”

Section: Terafet Spectrometer Principle Of Operationmentioning

confidence: 99%

“…This situation can be modeled by the following boundary conditions (see These equations can be rewritten in a form used in Ref. [12] (0) cos t,…”

Section: Homodyne Detector Operation Schemementioning

confidence: 99%

“…Importantly, a strong asymmetry can be also induced by the phase shift between the THz signals at the source and drain. For equal amplitudes of signals on the source and drain a b U U = nonzero phase shift θ between signals induces dc current [10][11][12] 2 sin a V U θ ∝ In [10][11][12], the circularly-polarized radiation was used to induce such a phase shift.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz plasmonic detector controlled by phase asymmetry

2019

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We demonstrate that phase-difference between terahertz signals on the source and drain of a field effect transistor (a TeraFET) induces a plasmon-assisted dc current, which is dramatically enhanced in vicinity of plasmonic resonances. We describe a TeraFET operation with identical amplitudes of radiation on source and drain antennas but with a phase-shiftinduced asymmetry. In this regime, the TeraFET operates as a tunable resonant polarizationsensitive plasmonic spectrometer operating in the sub-terahertz and terahertz range of frequencies. We also propose an effective scheme of a phase-sensitive homodyne detector operating in a phase-asymmetry mode, which allows for a dramatic enhancement of the response. These regimes can be implemented in different materials systems including silicon. The p-diamond TeraFETs could support operation in the 200 to 600 GHz atmospheric windows.

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“…The plasma wave velocity in 2D materials is normally an order of magnitude larger than the electron drift velocity and is much smaller than the speed of light. Hence, the plasmonic submicron-sized interferometers based on 2D materials are expected to operate efficiently in the terahertz (THz) frequency range. , In particular, it has been predicted theoretically that a field-effect transistor (FET) can serve as a simple device for studying plasmonic interference effects. − Specifically, it was suggested that an FET with two antennas attached to the drain and source shows a dc current response to circularly polarized THz radiation which is partially driven by the interference of plasma waves and by helicity of incoming radiation. The first experimental hint on the existence of such an interference contribution was reported in ref for an industrial FET, where helicity-driven effects were obtained due to unintentional peculiarities of contact pads.…”

Section: Introductionmentioning

confidence: 99%

Helicity-Sensitive Plasmonic Terahertz Interferometer

et al. 2020

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Plasmonic interferometry is a rapidly growing area of research with a huge potential for applications in terahertz frequency range. In this Letter, we explore a plasmonic interferometer based on graphene Field Effect Transistor connected to specially designed antennas. As a key result, we observe helicity-and phase-sensitive conversion of circularly-polarized radiation into dc photovoltage caused by the plasmon-interference mechanism: two plasma waves, excited at the source and drain part of the transistor interfere inside the channel. The helicity sensitive phase shift between these waves is achieved by using an asymmetric antenna configuration. The dc signal changes sign with inversion of the helicity. Suggested plasmonic interferometer is capable for measuring of phase difference between two arbitrary phase-shifted optical signals. The observed effect opens a wide avenue for phase-sensisitve probing of plasma wave excitations in two-dimensional materials.

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Plasmonic Helicity‐Driven Detector of Terahertz Radiation

Cited by 9 publications

References 56 publications

Survey of terahertz photonics and biophotonics

Survey of terahertz photonics and biophotonics

Terahertz plasmonic detector controlled by phase asymmetry

Helicity-Sensitive Plasmonic Terahertz Interferometer

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