Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals

Abstract Mid-infrared (IR) spectral region is of immense importance for astronomy, medical diagnosis, security and imaging due to the existence of the vibrational modes of many important molecules in this spectral range. Therefore, there is a particular interest in miniaturization and integration of...

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Autores principales:	Saurabh Dixit, Nihar Ranjan Sahoo, Abhishek Mall, Anshuman Kumar
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b16e0940c6074a589223c5d9a90b7f51
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spelling	oai:doaj.org-article:b16e0940c6074a589223c5d9a90b7f512021-12-02T13:24:14ZMid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals10.1038/s41598-021-86056-x2045-2322https://doaj.org/article/b16e0940c6074a589223c5d9a90b7f512021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86056-xhttps://doaj.org/toc/2045-2322Abstract Mid-infrared (IR) spectral region is of immense importance for astronomy, medical diagnosis, security and imaging due to the existence of the vibrational modes of many important molecules in this spectral range. Therefore, there is a particular interest in miniaturization and integration of IR optical components. To this end, 2D van der Waals (vdW) crystals have shown great potential owing to their ease of integration with other optoelectronic platforms and room temperature operation. Recently, 2D vdW crystals of $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2 \hbox {O}_5$$ V 2 O 5 have been shown to possess the unique phenomenon of natural in-plane biaxial hyperbolicity in the mid-infrared frequency regime at room temperature. Here, we report a unique application of this in-plane hyperbolicity for designing highly efficient, lithography free and extremely subwavelength mid-IR photonic devices for polarization engineering. In particular, we show the possibility of a significant reduction in the device footprint while maintaining an enormous extinction ratio from $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 based mid-IR polarizers. Furthermore, we investigate the application of sub-wavelength thin films of these vdW crystals towards engineering the polarization state of incident mid-IR light via precise control of polarization rotation, ellipticity and relative phase. We explain our results using natural in-plane hyperbolic anisotropy of $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 via both analytical and full-wave electromagnetic simulations. This work provides a lithography free alternative for miniaturized mid-infrared photonic devices using the hyperbolic anisotropy of $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 .Saurabh DixitNihar Ranjan SahooAbhishek MallAnshuman KumarNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Saurabh Dixit Nihar Ranjan Sahoo Abhishek Mall Anshuman Kumar Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals
description	Abstract Mid-infrared (IR) spectral region is of immense importance for astronomy, medical diagnosis, security and imaging due to the existence of the vibrational modes of many important molecules in this spectral range. Therefore, there is a particular interest in miniaturization and integration of IR optical components. To this end, 2D van der Waals (vdW) crystals have shown great potential owing to their ease of integration with other optoelectronic platforms and room temperature operation. Recently, 2D vdW crystals of $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2 \hbox {O}_5$$ V 2 O 5 have been shown to possess the unique phenomenon of natural in-plane biaxial hyperbolicity in the mid-infrared frequency regime at room temperature. Here, we report a unique application of this in-plane hyperbolicity for designing highly efficient, lithography free and extremely subwavelength mid-IR photonic devices for polarization engineering. In particular, we show the possibility of a significant reduction in the device footprint while maintaining an enormous extinction ratio from $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 based mid-IR polarizers. Furthermore, we investigate the application of sub-wavelength thin films of these vdW crystals towards engineering the polarization state of incident mid-IR light via precise control of polarization rotation, ellipticity and relative phase. We explain our results using natural in-plane hyperbolic anisotropy of $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 via both analytical and full-wave electromagnetic simulations. This work provides a lithography free alternative for miniaturized mid-infrared photonic devices using the hyperbolic anisotropy of $$\alpha$$ α - $$\hbox {MoO}_{3}$$ MoO 3 and $$\alpha$$ α - $$\hbox {V}_2$$ V 2 $$\hbox {O}_5$$ O 5 .
format	article
author	Saurabh Dixit Nihar Ranjan Sahoo Abhishek Mall Anshuman Kumar
author_facet	Saurabh Dixit Nihar Ranjan Sahoo Abhishek Mall Anshuman Kumar
author_sort	Saurabh Dixit
title	Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals
title_short	Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals
title_full	Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals
title_fullStr	Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals
title_full_unstemmed	Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals
title_sort	mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der waals crystals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b16e0940c6074a589223c5d9a90b7f51
work_keys_str_mv	AT saurabhdixit midinfraredpolarizationengineeringviasubwavelengthbiaxialhyperbolicvanderwaalscrystals AT niharranjansahoo midinfraredpolarizationengineeringviasubwavelengthbiaxialhyperbolicvanderwaalscrystals AT abhishekmall midinfraredpolarizationengineeringviasubwavelengthbiaxialhyperbolicvanderwaalscrystals AT anshumankumar midinfraredpolarizationengineeringviasubwavelengthbiaxialhyperbolicvanderwaalscrystals
_version_	1718393115238203392

Mid infrared polarization engineering via sub-wavelength biaxial hyperbolic van der Waals crystals

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