Invited article: ultra-broadband terahertz coherent detection via a silicon nitride-based deep sub-wavelength metallic slit

Tomasino, A., Piccoli, R., Jestin, Y., Delprat, S., Chaker, M., Peccianti, M., Clerici, M. , Busacca, A., Razzari, L. and Morandotti, R. (2018) Invited article: ultra-broadband terahertz coherent detection via a silicon nitride-based deep sub-wavelength metallic slit. APL Photonics, 3(11), 110805. (doi: 10.1063/1.5052628)

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Abstract

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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Clerici, Dr Matteo
Authors: Tomasino, A., Piccoli, R., Jestin, Y., Delprat, S., Chaker, M., Peccianti, M., Clerici, M., Busacca, A., Razzari, L., and Morandotti, R.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:APL Photonics
Publisher:AIP Publishing
ISSN:2378-0967
ISSN (Online):2378-0967
Published Online:12 November 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in APL Photonics 3(11): 110805
Publisher Policy:Reproduced under a Creative Commons License
Data DOI:10.5525/gla.researchdata.672

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