Solid-state-biased coherent detection of ultra-broadband terahertz pulses

Tomasino, Alessandro; Mazhorova, Anna; Clerici, Matteo; Peccianti, Marco; Ho, Sze Phing; Jestin, Y.; Pasquazi, Alessia; Markov, Andrey; Jin, Xin; Piccoli, Riccardo; Delprat, S.; Chaker, Mohamed; Busacca, Alessandro; Ali, Jalil; Razzari, Luca; Morandotti, Roberto

doi:10.1364/optica.4.001358

Cited by 32 publications

(26 citation statements)

References 22 publications

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“…This way, we are able to provide a fair comparison between the results achieved in the two configurations. In order to demonstrate the validity of Equations (4) and (5), we placed the SSBCD device at the detection position of an ultra-broadband THz Time-Domain Spectroscopy setup [ 29 ], featuring a two-color plasma source fed by a 150 fs, 800 nm, 1 kHz, 1.3 mJ pulsed laser. Such a source emitted ~10-THz-wide single-cycle pulses with a peak amplitude of

= 170 kV/cm, measured via electro-optic sampling in a 200-µm-thick GaP crystal [ 33 ], in a nitrogen-purged atmosphere.…”

Section: Resultsmentioning

confidence: 99%

“…The SSBCD technique has been extensively discussed in Refs [ 29 , 30 ]. For the sake of completeness, here we recall that the SSBCD method exploits the TFISH mechanism to sense THz radiation [ 31 ].…”

Section: Ssbcd Device Working Principlementioning

confidence: 99%

“…Inspired by the mechanism underlying the ABCD technique, we have recently presented a new paradigm named solid-state-biased coherent detection (SSBCD), which is operated through the use of CMOS-process-compatible solid-state devices. As explained in the following section, in the SSBCD device, the nonlinear interaction between the THz and the probe beams is confined into an epitaxial layer of either silica [ 29 ] or silicon nitride (SiN) [ 30 ], both having a deep-subwavelength thickness (~μm) and biased by a micro-sized metallic slit. The previous operating configuration adopted for the SSBCD techniques relied on a heterodyne scheme, similarly to the ABCD technique, yet allowing for a coherent detection of 10-THz-wide pulses at probe energies and bias voltages four and two orders of magnitude lower than the air-biased method, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Homodyne Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses with Static Electric Fields

et al. 2021

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We present an innovative implementation of the solid-state-biased coherent detection (SSBCD) technique, which we have recently introduced for the reconstruction of both amplitude and phase of ultra-broadband terahertz pulses. In our previous works, the SSBCD method has been operated via a heterodyne scheme, which involves demanding square-wave voltage amplifiers, phase-locked to the THz pulse train, as well as an electronic circuit for the demodulation of the readout signal. Here, we demonstrate that the SSBCD technique can be operated via a very simple homodyne scheme, exploiting plain static bias voltages. We show that the homodyne SSBCD signal turns into a bipolar transient when the static field overcomes the THz field strength, without the requirement of an additional demodulating circuit. Moreover, we introduce a differential configuration, which extends the applicability of the homodyne scheme to higher THz field strengths, also leading a two-fold improvement of the dynamic range compared to the heterodyne counterpart. Finally, we demonstrate that, by reversing the sign of the static voltage, it is possible to directly retrieve the absolute THz pulse polarity. The homodyne configuration makes the SSBCD technique of much easier access, leading to a vast range of field-resolved applications.

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= 170 kV/cm, measured via electro-optic sampling in a 200-µm-thick GaP crystal [ 33 ], in a nitrogen-purged atmosphere.…”

Section: Resultsmentioning

confidence: 99%

Section: Ssbcd Device Working Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Homodyne Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses with Static Electric Fields

et al. 2021

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“…parabolic mirror (see Figure S6 in the Supporting Information). [ 64 ] As for the previous case, Figure a depicts the experimental temporal waveforms recorded at the TTWWG input ( E in ) and output ( E out ), whereas Figure 5b shows their corresponding spectra. We note that the TTWWG spectrum is once again strongly enhanced in the low‐frequency range, as stated by the ≈1 THz redshift experienced by the peak frequency, compared to the air case.…”

Section: Experimental and Simulation Resultsmentioning

confidence: 99%

Time‐Domain Integration of Broadband Terahertz Pulses in a Tapered Two‐Wire Waveguide

Balistreri

Tomasino

Yurtsever

et al. 2021

Laser & Photonics Reviews

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In this work, the time‐domain integration of broadband terahertz (THz) pulses via a tapered two‐wire waveguide (TTWWG) is reported. Such a guiding structure consists of two metallic wires separated by a variable air gap that shrinks down to a subwavelength size as the movement takes from the waveguide input to its output. It is shown that while an input THz pulse propagates toward the subwavelength output gap, it is reshaped into its first‐order time integral waveform. In order to prove the TTWWG time integration functionality, the THz pulse is detected directly within the output gap of the waveguide, so as to prevent the outcoupling diffraction from altering the shape of the time‐integrated THz transient. Since the time‐domain integration is due to the tight geometrical confinement of the THz radiation in a subwavelength gap volume, the TTWWG operational spectral range can easily be tuned by judiciously changing both the output gap size and the tapering angle. The results lead to the physical realization of a broadband, analog THz time integrator device, which is envisioned to serve as a key building block for the implementation of complex and ultrahigh‐speed analog signal processing operations in THz communication systems.

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“…For the ⊥ geometry, the non-resonant contribution was only distinguishable for Δυ= −3.8 THz. When the non-resonant contribution was significant, we fit the data with a function that was the sum of two contributions: a Gaussian, which accounts for the instantaneous processes at sans-serifΔt = 0 ps, corresponding to the signal commonly considered in THz field-induced SHG (TFISH) [23,24,25,26,27], and a single-exponential decay, whose decay time τ represents the relaxation time of the non-resonant term. The resulting fit functions of this ‘non-resonant’ part of the THYR signal are reported as red solid curve in Figure 6a,c.…”

Section: Discussionmentioning

confidence: 99%

Coherent THz Hyper-Raman: Spectroscopy and Application in THz Detection

et al. 2019

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Recently we have demonstrated a new nonlinear optical effect in the THz interval of frequencies. The latter is based on the use of femtosecond optical pulses and intense, sub-ps, broadband terahertz (THz) pulses to generate a THz-optical four- and five-wave mixing in the investigated material. The spectrum of the generated signal is resolved in time and wavelength and displays two pronounced frequency sidebands, Stokes and anti-Stokes, close to the optical second harmonic central frequency 2ωL, where ωL is the optical central frequency of the fundamental beam, thus resembling the spectrum of standard hyper-Raman scattering, and hence we named this effect ‘THz hyper-Raman’—THYR. We applied this technique to several crystalline materials, including α-quartz and gallium selenide. In the first material, we find that the THYR technique brings spectroscopic information on a large variety of low-energy excitations that include polaritons and phonons far from the Γ-point, which are difficult to study with standard optical techniques. In the second example, we show that this new tool offers some advantages in detecting ultra-broadband THz pulses. In this paper we review these two recent results, showing the potentialities of this new THz technique.

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Solid-state-biased coherent detection of ultra-broadband terahertz pulses

Cited by 32 publications

References 22 publications

Homodyne Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses with Static Electric Fields

Homodyne Solid-State Biased Coherent Detection of Ultra-Broadband Terahertz Pulses with Static Electric Fields

Time‐Domain Integration of Broadband Terahertz Pulses in a Tapered Two‐Wire Waveguide

Coherent THz Hyper-Raman: Spectroscopy and Application in THz Detection

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