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Title: Adiabatic frequency shifting in epsilon-near-zero materials: the role of group velocity

Abstract

The conversion of a photon’s frequency has long been a key application area of nonlinear optics. It has been discussed how a slow temporal variation of a material’s refractive index can lead to the adiabatic frequency shift (AFS) of a pulse spectrum. Such a rigid spectral change has relevant technological implications, for example, in ultrafast signal processing. Here, we investigate the AFS process in epsilon-near-zero (ENZ) materials and show that the frequency shift can be achieved in a shorter length if operating in the vicinity of R e { ε <#comment/> r } = 0 . We also predict that, if the refractive index is induced by an intense optical pulse, the frequency shift is more efficient for a pump at the ENZ wavelength. Remarkably, we show that these effects are a consequence of the slow propagation speed of pulses at the ENZ wavelength. Our theoretical predictions are validated by experiments obtained for the AFS of optical pulses incident upon aluminum zinc oxide thin films at ENZ. Our results indicate that transparent metal oxides operating near the ENZ point are good candidates for future frequency conversion schemes.

Authors:
; ; ; ; ; ; ; ; ; ; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE; National Science Foundation (NSF); UK Research and Innovation; US Air Force Office of Scientific Research (AFOSR); Engineering and Physical Sciences Research Council (EPSRC); Royal Society; US Office of Naval Research (ONR)
OSTI Identifier:
1603392
Alternate Identifier(s):
OSTI ID: 1803149
Grant/Contract Number:  
SC0017717; 1741694; EP/S001573/1; FA9550-1-18-0151; FA9550-18-1-0002; EP/P019994/1; EP/P006078/2; HR00111820063; RGS/R1/191426; N00014-20-1-2199
Resource Type:
Published Article
Journal Name:
Optica
Additional Journal Information:
Journal Name: Optica Journal Volume: 7 Journal Issue: 3; Journal ID: ISSN 2334-2536
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Optics

Citation Formats

Khurgin, Jacob B., Clerici, Matteo, Bruno, Vincenzo, Caspani, Lucia, DeVault, Clayton, Kim, Jongbum, Shaltout, Amr, Boltasseva, Alexandra, Shalaev, Vladimir M., Ferrera, Marcello, Faccio, Daniele, and Kinsey, Nathaniel. Adiabatic frequency shifting in epsilon-near-zero materials: the role of group velocity. United States: N. p., 2020. Web. doi:10.1364/OPTICA.374788.
Khurgin, Jacob B., Clerici, Matteo, Bruno, Vincenzo, Caspani, Lucia, DeVault, Clayton, Kim, Jongbum, Shaltout, Amr, Boltasseva, Alexandra, Shalaev, Vladimir M., Ferrera, Marcello, Faccio, Daniele, & Kinsey, Nathaniel. Adiabatic frequency shifting in epsilon-near-zero materials: the role of group velocity. United States. https://doi.org/10.1364/OPTICA.374788
Khurgin, Jacob B., Clerici, Matteo, Bruno, Vincenzo, Caspani, Lucia, DeVault, Clayton, Kim, Jongbum, Shaltout, Amr, Boltasseva, Alexandra, Shalaev, Vladimir M., Ferrera, Marcello, Faccio, Daniele, and Kinsey, Nathaniel. Mon . "Adiabatic frequency shifting in epsilon-near-zero materials: the role of group velocity". United States. https://doi.org/10.1364/OPTICA.374788.
@article{osti_1603392,
title = {Adiabatic frequency shifting in epsilon-near-zero materials: the role of group velocity},
author = {Khurgin, Jacob B. and Clerici, Matteo and Bruno, Vincenzo and Caspani, Lucia and DeVault, Clayton and Kim, Jongbum and Shaltout, Amr and Boltasseva, Alexandra and Shalaev, Vladimir M. and Ferrera, Marcello and Faccio, Daniele and Kinsey, Nathaniel},
abstractNote = {The conversion of a photon’s frequency has long been a key application area of nonlinear optics. It has been discussed how a slow temporal variation of a material’s refractive index can lead to the adiabatic frequency shift (AFS) of a pulse spectrum. Such a rigid spectral change has relevant technological implications, for example, in ultrafast signal processing. Here, we investigate the AFS process in epsilon-near-zero (ENZ) materials and show that the frequency shift can be achieved in a shorter length if operating in the vicinity of R e { ε <#comment/> r } = 0 . We also predict that, if the refractive index is induced by an intense optical pulse, the frequency shift is more efficient for a pump at the ENZ wavelength. Remarkably, we show that these effects are a consequence of the slow propagation speed of pulses at the ENZ wavelength. Our theoretical predictions are validated by experiments obtained for the AFS of optical pulses incident upon aluminum zinc oxide thin films at ENZ. Our results indicate that transparent metal oxides operating near the ENZ point are good candidates for future frequency conversion schemes.},
doi = {10.1364/OPTICA.374788},
journal = {Optica},
number = 3,
volume = 7,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
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https://doi.org/10.1364/OPTICA.374788

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