Visible photon generation via four-wave mixing in near-infrared near-zero-index thin films

Carnemolla, E. G., Jaffray, W., Clerici, M. , Caspani, L., Faccio, D. , Biancalana, F., DeVault, C., Shalaev, V. M., Boltasseva, A. and Ferrera, M. (2021) Visible photon generation via four-wave mixing in near-infrared near-zero-index thin films. Optics Letters, 46(21), pp. 5433-5436. (doi: 10.1364/OL.433834) (PMID:34724494)

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Abstract

Optical nonlinearities can be strongly enhanced by operating in the so-called near-zero-index (NZI) regime, where the real part of the refractive index of the system under investigation approaches zero. Here we experimentally demonstrate semi-degenerate four-wave mixing (FWM) in aluminum zinc oxide thin films generating radiation tunable in the visible spectral region, where the material is highly transparent. To this end, we employed an intense pump (787 nm) and a seed tunable in the NIR window (1100–1500 nm) to generate a visible idler wave (530–620 nm). Experiments show enhancement of the frequency conversion efficiency with a maximum of 2% and a signal-to-pump detuning of 360 nm. Effective idler wavelength tuning has also been demonstrated by operating on the temporal delay between the pump and signal.

Item Type:Articles
Additional Information:Funding. Air Force Office of Scientific Research (FA9550-18-1-0002); Engineering and Physical Sciences Research Council (EP/P005446/1); Division of Materials Research (DE-SC0017717); Office of Naval Research (N00014-20-1-2199); Carnegie Trust for the Universities of Scotland (RIG009891); UK Research and Innovation (EP/S001573/1).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Faccio, Professor Daniele and Clerici, Professor Matteo
Authors: Carnemolla, E. G., Jaffray, W., Clerici, M., Caspani, L., Faccio, D., Biancalana, F., DeVault, C., Shalaev, V. M., Boltasseva, A., and Ferrera, M.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Optics Letters
Publisher:Optical Society of America
ISSN:0146-9592
ISSN (Online):1539-4794
Published Online:28 October 2021
Copyright Holders:Copyright © 2021 Optica Publishing Group
First Published:First published in Optics Letters 46(21): 5433-5436
Publisher Policy:Reproduced under a Creative Commons licence

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302459Infrared time-domain quantum opticsMatteo ClericiEngineering and Physical Sciences Research Council (EPSRC)EP/S001573/1ENG - Electronics & Nanoscale Engineering