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, Professor 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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