A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity

Abstract The scope and potential uses of time-domain terahertz imaging and spectroscopy are mainly limited by the low optical-to-terahertz conversion efficiency of photoconductive terahertz sources. State-of-the-art photoconductive sources utilize short-carrier-lifetime semiconductors to recombine c...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Nezih Tolga Yardimci, Semih Cakmakyapan, Soroosh Hemmati, Mona Jarrahi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1b7615dda7734925a7e31bb584e46dd6
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:1b7615dda7734925a7e31bb584e46dd6
record_format	dspace
spelling	oai:doaj.org-article:1b7615dda7734925a7e31bb584e46dd62021-12-02T15:06:17ZA High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity10.1038/s41598-017-04553-42045-2322https://doaj.org/article/1b7615dda7734925a7e31bb584e46dd62017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04553-4https://doaj.org/toc/2045-2322Abstract The scope and potential uses of time-domain terahertz imaging and spectroscopy are mainly limited by the low optical-to-terahertz conversion efficiency of photoconductive terahertz sources. State-of-the-art photoconductive sources utilize short-carrier-lifetime semiconductors to recombine carriers that cannot contribute to efficient terahertz generation and cause additional thermal dissipation. Here, we present a novel photoconductive terahertz source that offers a significantly higher efficiency compared with terahertz sources fabricated on short-carrier-lifetime substrates. The key innovative feature of this source is the tight three-dimensional confinement of the optical pump beam around the terahertz nanoantennas that are used as radiating elements. This is achieved by means of a nanocavity formed by plasmonic structures and a distributed Bragg reflector. Consequently, almost all of the photo-generated carriers can be routed to the terahertz nanoantennas within a sub-picosecond time-scale. This results in a very strong, ultrafast current that drives the nanoantennas to produce broadband terahertz radiation. We experimentally demonstrate that this terahertz source can generate 4 mW pulsed terahertz radiation under an optical pump power of 720 mW over the 0.1–4 THz frequency range. This is the highest reported power level for terahertz radiation from a photoconductive terahertz source, representing more than an order of magnitude of enhancement in the optical-to-terahertz conversion efficiency compared with state-of-the-art photoconductive terahertz sources fabricated on short-carrier-lifetime substrates.Nezih Tolga YardimciSemih CakmakyapanSoroosh HemmatiMona JarrahiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nezih Tolga Yardimci Semih Cakmakyapan Soroosh Hemmati Mona Jarrahi A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity
description	Abstract The scope and potential uses of time-domain terahertz imaging and spectroscopy are mainly limited by the low optical-to-terahertz conversion efficiency of photoconductive terahertz sources. State-of-the-art photoconductive sources utilize short-carrier-lifetime semiconductors to recombine carriers that cannot contribute to efficient terahertz generation and cause additional thermal dissipation. Here, we present a novel photoconductive terahertz source that offers a significantly higher efficiency compared with terahertz sources fabricated on short-carrier-lifetime substrates. The key innovative feature of this source is the tight three-dimensional confinement of the optical pump beam around the terahertz nanoantennas that are used as radiating elements. This is achieved by means of a nanocavity formed by plasmonic structures and a distributed Bragg reflector. Consequently, almost all of the photo-generated carriers can be routed to the terahertz nanoantennas within a sub-picosecond time-scale. This results in a very strong, ultrafast current that drives the nanoantennas to produce broadband terahertz radiation. We experimentally demonstrate that this terahertz source can generate 4 mW pulsed terahertz radiation under an optical pump power of 720 mW over the 0.1–4 THz frequency range. This is the highest reported power level for terahertz radiation from a photoconductive terahertz source, representing more than an order of magnitude of enhancement in the optical-to-terahertz conversion efficiency compared with state-of-the-art photoconductive terahertz sources fabricated on short-carrier-lifetime substrates.
format	article
author	Nezih Tolga Yardimci Semih Cakmakyapan Soroosh Hemmati Mona Jarrahi
author_facet	Nezih Tolga Yardimci Semih Cakmakyapan Soroosh Hemmati Mona Jarrahi
author_sort	Nezih Tolga Yardimci
title	A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity
title_short	A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity
title_full	A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity
title_fullStr	A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity
title_full_unstemmed	A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity
title_sort	high-power broadband terahertz source enabled by three-dimensional light confinement in a plasmonic nanocavity
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/1b7615dda7734925a7e31bb584e46dd6
work_keys_str_mv	AT nezihtolgayardimci ahighpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity AT semihcakmakyapan ahighpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity AT sorooshhemmati ahighpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity AT monajarrahi ahighpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity AT nezihtolgayardimci highpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity AT semihcakmakyapan highpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity AT sorooshhemmati highpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity AT monajarrahi highpowerbroadbandterahertzsourceenabledbythreedimensionallightconfinementinaplasmonicnanocavity
_version_	1718388497751998464

A High-Power Broadband Terahertz Source Enabled by Three-Dimensional Light Confinement in a Plasmonic Nanocavity

Ejemplares similares