A hybrid broadband metalens operating at ultraviolet frequencies

Abstract The investigation on metalenses have been rapidly developing, aiming to bring compact optical devices with superior properties to the market. Realizing miniature optics at the UV frequency range in particular has been challenging as the available transparent materials have limited range of...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Farhan Ali, Serap Aksu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6c6bdef261c348d58a3bab2d915638f8
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:6c6bdef261c348d58a3bab2d915638f8
record_format	dspace
spelling	oai:doaj.org-article:6c6bdef261c348d58a3bab2d915638f82021-12-02T10:48:03ZA hybrid broadband metalens operating at ultraviolet frequencies10.1038/s41598-021-81956-42045-2322https://doaj.org/article/6c6bdef261c348d58a3bab2d915638f82021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-81956-4https://doaj.org/toc/2045-2322Abstract The investigation on metalenses have been rapidly developing, aiming to bring compact optical devices with superior properties to the market. Realizing miniature optics at the UV frequency range in particular has been challenging as the available transparent materials have limited range of dielectric constants. In this work we introduce a low absorption loss and low refractive index dielectric material magnesium oxide, MgO, as an ideal candidate for metalenses operating at UV frequencies. We theoretically investigate metalens designs capable of efficient focusing over a broad UV frequency range (200–400 nm). The presented metalenses are composed of sub-wavelength MgO nanoblocks, and characterized according to the geometric Pancharatnam–Berry phase method using FDTD method. The presented broadband metalenses can focus the incident UV light on tight focal spots (182 nm) with high numerical aperture ( $$\hbox {NA}\approx 0.8$$ NA ≈ 0.8 ). The polarization conversion efficiency of the metalens unit cell and focusing efficiency of the total metalens are calculated to be as high as 94%, the best value reported in UV range so far. In addition, the metalens unit cell can be hybridized to enable lensing at multiple polarization states. The presented highly efficient MgO metalenses can play a vital role in the development of UV nanophotonic systems and could pave the way towards the world of miniaturization.Farhan AliSerap AksuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Farhan Ali Serap Aksu A hybrid broadband metalens operating at ultraviolet frequencies
description	Abstract The investigation on metalenses have been rapidly developing, aiming to bring compact optical devices with superior properties to the market. Realizing miniature optics at the UV frequency range in particular has been challenging as the available transparent materials have limited range of dielectric constants. In this work we introduce a low absorption loss and low refractive index dielectric material magnesium oxide, MgO, as an ideal candidate for metalenses operating at UV frequencies. We theoretically investigate metalens designs capable of efficient focusing over a broad UV frequency range (200–400 nm). The presented metalenses are composed of sub-wavelength MgO nanoblocks, and characterized according to the geometric Pancharatnam–Berry phase method using FDTD method. The presented broadband metalenses can focus the incident UV light on tight focal spots (182 nm) with high numerical aperture ( $$\hbox {NA}\approx 0.8$$ NA ≈ 0.8 ). The polarization conversion efficiency of the metalens unit cell and focusing efficiency of the total metalens are calculated to be as high as 94%, the best value reported in UV range so far. In addition, the metalens unit cell can be hybridized to enable lensing at multiple polarization states. The presented highly efficient MgO metalenses can play a vital role in the development of UV nanophotonic systems and could pave the way towards the world of miniaturization.
format	article
author	Farhan Ali Serap Aksu
author_facet	Farhan Ali Serap Aksu
author_sort	Farhan Ali
title	A hybrid broadband metalens operating at ultraviolet frequencies
title_short	A hybrid broadband metalens operating at ultraviolet frequencies
title_full	A hybrid broadband metalens operating at ultraviolet frequencies
title_fullStr	A hybrid broadband metalens operating at ultraviolet frequencies
title_full_unstemmed	A hybrid broadband metalens operating at ultraviolet frequencies
title_sort	hybrid broadband metalens operating at ultraviolet frequencies
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6c6bdef261c348d58a3bab2d915638f8
work_keys_str_mv	AT farhanali ahybridbroadbandmetalensoperatingatultravioletfrequencies AT serapaksu ahybridbroadbandmetalensoperatingatultravioletfrequencies AT farhanali hybridbroadbandmetalensoperatingatultravioletfrequencies AT serapaksu hybridbroadbandmetalensoperatingatultravioletfrequencies
_version_	1718396653613875200

A hybrid broadband metalens operating at ultraviolet frequencies

Ejemplares similares