Bifunctional metamirrors for simultaneous polarization splitting and focusing

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Abstract

Metasurfaces - artificial 2D sheet structures with sub-wavelength periodicity and dimensions of elements - are paving the way to improve traditional optical components by integrating multiple functionalities into one optically flat device. With the progress in nano-fabrication methods, different applications of metasurfaces were demonstrated experimentally, ranging from artificial plasmonic colouring to flat optical components. In this work, we demonstrate implementation of a bifunctional gap-surface-plasmon-based metasurface which, in reflection mode, splits orthogonal linear light polarizations and focuses into different focal spots. The fabricated configuration consists of 50 nm thick gold nanobricks with different lateral dimensions, organized in an array of 240 nm x 240 nm unit cells on the top of a 50 nm thick silicon dioxide layer, which is deposited on an optically thick reflecting gold substrate. Structure is fabricated using standard electron beam lithography and lift-off techniques. Characterization is performed using scanning electron microscopy and optical measurements, including investigation of wavelength dependence of efficiency, focal length and polarization extinction ratio. Our device features high efficiency (up to ∼65%) and polarization extinction ratio (up to ∼30 dB), exhibiting broadband response in the near-infrared band (750 950 nm wavelength) with the focal length and numerical aperture dependent on the wavelength of incident light. The proposed optical component can be straightforwardly integrated into photonic circuits or fiber optic devices which employ polarization multiplexing.

Original languageEnglish
Title of host publicationProceedings of SPIE Photonics Europe : Metamaterials XI
EditorsAllan D. Boardman, Anatoly V. Zayats, Kevin F. MacDonald
Volume10671
PublisherSPIE - International Society for Optical Engineering
Publication dateMay 2018
Article number106712C
ISBN (Electronic)9781510618688
DOIs
Publication statusPublished - May 2018
EventSPIE Photonics Europe 2018 - Strasbourg, France
Duration: 22. Apr 201826. Apr 2018

Conference

ConferenceSPIE Photonics Europe 2018
CountryFrance
CityStrasbourg
Period22/04/201826/04/2018
SponsorCNRS - The National Center for Scientific Research, et al., iCube, Investissements d'Avenvir, Strasbourg the Europtimist, The Society of Photo-Optical Instrumentation Engineers (SPIE)

Fingerprint

polarization
wavelengths
extinction
gold
nanofabrication
numerical aperture
multiplexing
optical measurement
periodic variations
fiber optics
lithography
apertures
photonics
optics
electron beams
silicon dioxide
broadband
scanning electron microscopy
configurations
cells

Keywords

  • at optics
  • gap surface plasmons
  • gradient metasurfaces
  • plasmonics

Cite this

Boroviks, S., Deshpande, R. A., Mortensen, N. A., & Bozhevolnyi, S. I. (2018). Bifunctional metamirrors for simultaneous polarization splitting and focusing. In A. D. Boardman, A. V. Zayats, & K. F. MacDonald (Eds.), Proceedings of SPIE Photonics Europe: Metamaterials XI (Vol. 10671). [106712C] SPIE - International Society for Optical Engineering. https://doi.org/10.1117/12.2306439
Boroviks, Sergejs ; Deshpande, Rucha Anil ; Mortensen, N. Asger ; Bozhevolnyi, Sergey I. / Bifunctional metamirrors for simultaneous polarization splitting and focusing. Proceedings of SPIE Photonics Europe: Metamaterials XI. editor / Allan D. Boardman ; Anatoly V. Zayats ; Kevin F. MacDonald. Vol. 10671 SPIE - International Society for Optical Engineering, 2018.
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Boroviks, S, Deshpande, RA, Mortensen, NA & Bozhevolnyi, SI 2018, Bifunctional metamirrors for simultaneous polarization splitting and focusing. in AD Boardman, AV Zayats & KF MacDonald (eds), Proceedings of SPIE Photonics Europe: Metamaterials XI. vol. 10671, 106712C, SPIE - International Society for Optical Engineering, SPIE Photonics Europe 2018, Strasbourg, France, 22/04/2018. https://doi.org/10.1117/12.2306439

Bifunctional metamirrors for simultaneous polarization splitting and focusing. / Boroviks, Sergejs; Deshpande, Rucha Anil; Mortensen, N. Asger; Bozhevolnyi, Sergey I.

Proceedings of SPIE Photonics Europe: Metamaterials XI. ed. / Allan D. Boardman; Anatoly V. Zayats; Kevin F. MacDonald. Vol. 10671 SPIE - International Society for Optical Engineering, 2018. 106712C.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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AB - Metasurfaces - artificial 2D sheet structures with sub-wavelength periodicity and dimensions of elements - are paving the way to improve traditional optical components by integrating multiple functionalities into one optically flat device. With the progress in nano-fabrication methods, different applications of metasurfaces were demonstrated experimentally, ranging from artificial plasmonic colouring to flat optical components. In this work, we demonstrate implementation of a bifunctional gap-surface-plasmon-based metasurface which, in reflection mode, splits orthogonal linear light polarizations and focuses into different focal spots. The fabricated configuration consists of 50 nm thick gold nanobricks with different lateral dimensions, organized in an array of 240 nm x 240 nm unit cells on the top of a 50 nm thick silicon dioxide layer, which is deposited on an optically thick reflecting gold substrate. Structure is fabricated using standard electron beam lithography and lift-off techniques. Characterization is performed using scanning electron microscopy and optical measurements, including investigation of wavelength dependence of efficiency, focal length and polarization extinction ratio. Our device features high efficiency (up to ∼65%) and polarization extinction ratio (up to ∼30 dB), exhibiting broadband response in the near-infrared band (750 950 nm wavelength) with the focal length and numerical aperture dependent on the wavelength of incident light. The proposed optical component can be straightforwardly integrated into photonic circuits or fiber optic devices which employ polarization multiplexing.

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VL - 10671

BT - Proceedings of SPIE Photonics Europe

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PB - SPIE - International Society for Optical Engineering

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Boroviks S, Deshpande RA, Mortensen NA, Bozhevolnyi SI. Bifunctional metamirrors for simultaneous polarization splitting and focusing. In Boardman AD, Zayats AV, MacDonald KF, editors, Proceedings of SPIE Photonics Europe: Metamaterials XI. Vol. 10671. SPIE - International Society for Optical Engineering. 2018. 106712C https://doi.org/10.1117/12.2306439