Birefringence measurements of diamond space-variant subwavelength gratings

Birefringence; Birefringence measurements; Experimental methods; Fast axis orientation; Incident wavelength; Intensity variations; Manufacturing process; Sub-wavelength grating; Transverse electrics; Optical instruments

Abstract :

[en] Subwavelength gratings are gratings with periods smaller than the incident wavelength. They possess form birefringence, which depends on the grating parameters. This paper presents the results of an experimental method designed to measure the birefringent properties of diamond subwavelength gratings in the mid-infrared. The method consists of monitoring the intensity transmitted through one polarizer, a subwavelength grating, and a second polarizer for various orientations of the first polarizer. By fitting the intensity variation as a function of the orientation of the first polarizer, one can compute the phase shift induced by the grating, its local fast axis orientation, and the ratio of the transverse electric and transverse magnetic transmission efficiencies. The paper describes the method principle and its mathematical model. Then, several numerical simulations of different subwavelength gratings are presented and their results are discussed. Finally, the optical setup is described and the measurements of one subwavelength grating are displayed and compared with the values expected from the manufacturing process. © 2018 Optical Society of America.

Research Center/Unit :

STAR - Space sciences, Technologies and Astrophysics Research - ULiège

Disciplines :

Physics

Author, co-author :

Piron, Pierre ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)

Vargas Catalan, E.; Department of Engineering Sciences, Ångström Laboratory, Uppsala University, Box 534, Uppsala, Sweden

Absil, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > ISSPSILAB

Karlsson, M.; Department of Engineering Sciences, Ångström Laboratory, Uppsala University, Box 534, Uppsala, Sweden

Language :

English

Title :

Birefringence measurements of diamond space-variant subwavelength gratings

Publication date :

10 June 2018

Journal title :

Applied Optics

ISSN :

1559-128X

eISSN :

2155-3165

Publisher :

OSA - The Optical Society

Volume :

Issue :

Pages :

4909-4917

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2018ApOpt..57.4909P

European Projects :

FP7 - 337569 - VORTEX - Taking extrasolar planet imaging to a new level with vector vortex coronagraphy

Funders :

CE - Commission Européenne [BE]

Available on ORBi :

since 16 August 2018

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