Optical Transistor for Amplification of Radiation in a Broadband Terahertz Domain

Villegas, Kristian Hauser; Kusmartsev, F. V.; Luo, Yi; Savenko, I. G.

doi:10.1103/physrevlett.124.087701

Cited by 21 publications

(8 citation statements)

References 88 publications

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“…The demonstration of Stark ladders and coherent Bloch oscillations 13 paved the way for SSL multipliers (SSLMs) to provide radiation up to the 54th harmonic at 8.1 THz as well as for their use in heterodyne detection with applications to high-resolution spectroscopy 14 , 15 . Compact high performance superlattice electron devices (SLEDs) have recently reached a record room temperature 4.2 mW power output in the fundamental mode at 145 GHz 16 and synchronization between SSLs leads to a dramatic increase in output power 2 . In both cases there are propagating charge domains that produce powerful high-frequency GHz radiation and which are triggered by negative differential conductivity (NDC).…”

Section: Introductionmentioning

confidence: 99%

Giant controllable gigahertz to terahertz nonlinearities in superlattices

Pereira

Anfertev

Shevchenko

et al. 2020

Sci Rep

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Optical nonlinearities are of perpetual importance, notably connected with emerging new materials. However, they are difficult to exploit in the gigahertz–terahertz (GHz–THz) range at room temperature and using low excitation power. Here, we present a clear-cut theoretical and experimental demonstration of real time, low power, room temperature control of GHz–THz nonlinearities. The nonlinear susceptibility concept, successful in most materials, cannot be used here and we show in contrast, a complex interplay between applied powers, voltages and asymmetric current flow, delivering giant control and enhancement of the nonlinearities. Semiconductor superlattices are used as nonlinear sources and as mixers for heterodyne detection, unlocking their dual potential as compact, room temperature, controllable sources and detectors. The low input powers and voltages applied are within the range of compact devices, enabling the practical extension of nonlinear optics concepts to the GHz–THz range, under controlled conditions and following a predictive design tool.

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Section: Introductionmentioning

confidence: 99%

Giant controllable gigahertz to terahertz nonlinearities in superlattices

Pereira

Anfertev

Shevchenko

et al. 2020

Sci Rep

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“…Despite the substantial success in current approaches to decrease the THz light reflection, obtaining surfaces with 100% anti-reflection and transmission rates still remains one of the main obstacles in the construction of perfect optical devices such as flat Veselago-Pendry lenses. Current advances in 2D materials have demonstrated that fabrication of hybrid structures made up of graphene and superconductors can lead to a significant enhancement in light sensitivity [2]. Similar trends have been observed in graphene covered by a thin film of colloidal quantum dots, where extremely strong photoelectric effect provides enormous gain for photo-detection (about 10 8 electrons per photon) [3].…”

Section: Introductionmentioning

confidence: 71%

“…Recent innovations in thin film technology have shown that heterostructures made of graphene and superconductors can be used effectively to amplify and generate THz waves [2,6,7]. Such heterostructures are unique objects that utilise the principles of vacuum solid-state nano-electronics for the amplification and detection of THz waves.…”

Section: Introductionmentioning

confidence: 99%

Perfect Impedance Matching with Meta-Surfaces Made of Ultra-Thin Metal Films: A Phenomenological Approach to the Ideal THz Sensors

Zhang¹,

Liu²,

Luo³

et al. 2020

Materials

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The terahertz (THz) frequency range is incredibly important as it covers electromagnetic emissions typical for biological and molecular processes. All molecules emit THz waves in a unique fingerprint pattern, although the intensity of such signals is usually too weak to be detected. To address the efficiency gap in existing THz devices it is extremely important to create surfaces with perfect anti-reflection properties. Although metals are absolutely reflective, here we show both theoretically and experimentally that by constructing meta-surfaces made of a superposition of ultra-thin metallic nano-films (a couple of nanometres thick) and oxide layers a unique property of perfect transmission and impedance matching may be realised. The perfect transmission rates can be as high as 100% and it may be achieved in both optical and THz regimes. The predicted effect has been observed for numerous meta-surfaces of different compositions. The effect found here is expected to impact the renewable energies sectors, optoelectronic and telecommunication industries, accelerating the arrival of the sensors for the new 6G-technology. The phenomenon is highly relevant to all scientific fields where minimising electromagnetic losses through reflection is important.

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“…Other examples of hybrid Bose-Fermi systems comprise electron gas -superconductor [25][26][27] , exciton gas -2D electron gas (2DEG) 28 , and exciton-polaritons in a microcavity -2DEG systems 29 . From that perspective, a superconductor in the fluctuating regime can be looked at as a hybrid Bose-Fermi system, where two gases described by different quantum statistics coexist in one (same) 2D layer, forming a Bose-Fermi mixture.…”

Section: Introductionmentioning

confidence: 99%

Magnetoplasmon resonance technique to monitor two-dimensional Dirac superconductors in fluctuating regime

Sonowal,

Kovalev,

Savenko

2021

Preprint

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We propose the magnetoplasmon resonance technique to investigate two-dimensional superconductors (taking MoS2 as an example) in the fluctuating regime, where the temperature is slightly above the critical temperature of the superconducting transition. Thus, unpaired electrons and fluctuating Cooper pairs coexist in the system and interact with each other via long-range Coulomb forces, forming a Bose-Fermi mixture. We expose the sample to external time-dependent electromagnetic field with a frequency in sub-terahertz range and a permanent magnetic field, and show that the magnetoplasmon response of the system is strongly modified in the presence of superconducting fluctuations in the vicinity of the superconducting transition. In particular, the fluctuating Cooper pairs dramatically change the position and broadening of the magnetoplasmon resonance, which is reflected in the optical response of the system.

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Optical Transistor for Amplification of Radiation in a Broadband Terahertz Domain

Cited by 21 publications

References 88 publications

Giant controllable gigahertz to terahertz nonlinearities in superlattices

Giant controllable gigahertz to terahertz nonlinearities in superlattices

Perfect Impedance Matching with Meta-Surfaces Made of Ultra-Thin Metal Films: A Phenomenological Approach to the Ideal THz Sensors

Magnetoplasmon resonance technique to monitor two-dimensional Dirac superconductors in fluctuating regime

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