High-resolution broadband terahertz spectroscopy via electronic heterodyne detection of photonically generated terahertz frequency comb

Pavelyev, D. G.; Skryl, A. S.; Бакунов, М. И.

doi:10.1364/ol.39.005669

Cited by 10 publications

(10 citation statements)

References 14 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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“…In particular, electron transport in semiconductor superlattices (SLs) is associated with a variety of quantum mechanical and kinetic effects [9,10]. Those effects are able to enhance the electron mobility and induce terahertz (THz) dynamics of electrons [1,11,12] making SLs to be a promising element for designing THz sources [13,14], amplifiers [15], and frequency mixers [16].…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamics and band transport in a superlattice driven by a plane wave

et al. 2017

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A quantum particle transport induced in a spatially-periodic potential by a propagating plane wave has a number important implications in a range of topical physical systems. Examples include acoustically driven semiconductor superlattices and cold atoms in optical crystal. Here we apply kinetic description of the directed transport in a superlattice beyond standard linear approximation, and utilize exact path-integral solutions of the semiclassical transport equation. We show that the particle drift and average velocities have non-monotonic dependence on the wave amplitude with several prominent extrema. Such nontrivial kinetic behaviour is related to global bifurcations developing with an increase of the wave amplitude. They cause dramatic transformations of the system phase space and lead to changes of the transport regime. We describe different types of phase trajectories contributing to the directed transport and analyse their spectral content.

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“…Another approach-especially for high-precision, and broadband THz spectroscopy-is dual-comb spectroscopy. [8][9][10][11][12][13][14][15] A dual-comb setup has no moving parts and in addition allows a very precise measurement of the frequency. Since in existing THz dual-comb setups the THz signal is not generated directly, they still present a wide footprint and low THz powers.…”

mentioning

confidence: 99%

“…Since in existing THz dual-comb setups the THz signal is not generated directly, they still present a wide footprint and low THz powers. 10,[13][14][15] In contrast, terahertz quantum cascade lasers (THz QCLs) are a very promising technology for applications at THz frequencies. 1,16,17 THz QCLs have the advantage that they provide much more power, operate in continuous wave (CW), and extend towards higher frequencies.…”

mentioning

confidence: 99%

On-chip, self-detected terahertz dual-comb source

Rösch

Scalari

Villares

et al. 2016

Applied Physics Letters

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We present a directly generated on-chip dual-comb source at terahertz (THz) frequencies. The multi-heterodyne beating signal of two free-running THz quantum cascade laser frequency combs is measured electrically using one of the combs as a detector, fully exploiting the unique characteristics of quantum cascade active regions. Up to 30 modes can be detected corresponding to a spectral bandwidth of 630 GHz, being the available bandwidth of the dual comb configuration. The multi-heterodyne signal is used to investigate the equidistance of the comb modes showing an accuracy of 10−12 at the carrier frequency of 2.5 THz.

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High-resolution broadband terahertz spectroscopy via electronic heterodyne detection of photonically generated terahertz frequency comb

Cited by 10 publications

References 14 publications

Giant controllable gigahertz to terahertz nonlinearities in superlattices

Giant controllable gigahertz to terahertz nonlinearities in superlattices

Nonlinear dynamics and band transport in a superlattice driven by a plane wave

On-chip, self-detected terahertz dual-comb source

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