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Plasmonic tuning of nano-antennas for super-gain light amplification
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Date
2024-04-01
Author
Aşırım, Özüm Emre
Kuzuoğlu, Mustafa
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Nanoscale conductive materials are often used for inducing localized free electron oscillations known as plasmons. This is due to their high electronic excitability under optical irradiation owing to their super-small volume. Recently, plasmons have been of interest for enhancing the gain-bandwidth product of optical amplifiers. There are currently two well-established mechanisms for light amplification. The first one is via stimulated emission of radiation (lasers) using a given energy source and often an optical feedback mechanism. The second one is based on the nonlinear coupling of a low-intensity input wave and a high-intensity pump wave for energy exchange (parametric amplifiers). Both techniques have shortcomings. Lasers have a small operation bandwidth and offer a limited gain, but require moderate energy pumping to operate. Whereas optical parametric amplifiers (OPAs) offer a high operation bandwidth along with a much higher optical gain, with the drawback of requiring intense pumping to be functional. The aim of this paper is to introduce a technique that combines the advantages and eliminates the drawbacks of both techniques in the nanoscale to allow for a better amplification performance in integrated optical devices. This is achieved by inducing a plasmonic chirp in conductive nanomaterials a.k.a nano-antennas, which enables the confinement of an enormous electric energy density that can be coupled to an input beam for amplification. Using the Finite Difference Time Domain numerical-method with the material parameters of well-known semiconductors, intramaterial condensation of electric energy density is observed in semiconductor nano-antennas for certain plasmonic chirp-frequencies which enables broadband high-gain optical amplification based on free-electron oscillations that is promising for small-scale optical devices requiring a high gain-bandwidth product. The results are in good agreement with semiempirical data.
Subject Keywords
high energy density
,
lasers
,
nano-antenna
,
optical amplification
,
plasmon
,
semiconductors
URI
https://hdl.handle.net/11511/109751
Journal
JPhys Photonics
DOI
https://doi.org/10.1088/2515-7647/ad3d1c
Collections
Department of Electrical and Electronics Engineering, Article
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BibTeX
Ö. E. Aşırım and M. Kuzuoğlu, “Plasmonic tuning of nano-antennas for super-gain light amplification,”
JPhys Photonics
, vol. 6, no. 2, pp. 0–0, 2024, Accessed: 00, 2024. [Online]. Available: https://hdl.handle.net/11511/109751.