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Ultra-broadband terahertz coherent detection via a silicon nitride-based deep sub-wavelength metallic slit

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posted on 2023-06-09, 15:38 authored by Alessandro Tomasino, Riccardo Piccoli, Yoann Jestin, Sebastien Delprat, Mohamed Chaker, Marco Peccianti, Matteo Clerici, Alessandro Busacca, Luca Razzari, Roberto Morandotti
We present a novel class of CMOS-compatible devices aimed to perform the solid-state-biased coherent detection of ultrashort terahertz pulses, i.e. featuring a gap-free bandwidth at least two decades-wide. Such a structure relies on a 1-µm-wide slit aperture located between two parallel aluminum pads, embedded in a 1-µm-thick layer of silicon nitride, and deposited on a quartz substrate. We show that this device can detect ultra-broadband terahertz pulses by employing unprecedented low optical probe energies of only a few tens of nanojoules. This is due to the more than one order of magnitude higher nonlinear coefficient of silicon nitride with respect to silica, the nonlinear material employed in the previous generations. In addition, due to the reduced distance between the aluminum pads, very high static electric fields can be generated within the slit by applying extremely low external bias voltages (in the order of few tens of volts), which strongly enhance the dynamic range of the detected THz waveforms. These results pave the way to the integration of solid-state ultra-broadband detection in compact and miniaturized terahertz systems fed by high repetition-rate laser oscillators and low-noise, low-voltage generators.

Funding

UK Quantum Technology Hub for Sensors and Metrology; G1511; EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCIL; EP/M013294/1

History

Publication status

  • Published

File Version

  • Published version

Journal

APL Photonics

ISSN

2378-0967

Publisher

AIP Publishing

Issue

11

Volume

3

Page range

110805

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Sussex Centre for Quantum Technologies Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2018-11-14

First Open Access (FOA) Date

2018-11-14

First Compliant Deposit (FCD) Date

2018-10-25

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