A new artificial material approach for flat THz frequency lenses

Savini, Giorgio, Ade, Peter A. R. ORCID: https://orcid.org/0000-0002-5127-0401 and Zhang, Jin 2012. A new artificial material approach for flat THz frequency lenses. Optics Express 20 (23) , pp. 25766-25773. 10.1364/OE.20.025766

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Abstract

Stacked layers of metal meshes embedded in a dielectric substrate are routinely used for providing spectral selection at THz frequencies. Recent work has shown that particular geometries allow the refractive index to be tuned to produce practical artificial materials. Here we show that by spatially grading in the plane of the mesh we can manufacture a Graded Index (GrIn) thin flat lens optimized for use at THz frequencies. Measurements on a prototype lens show we are able to obtain the parabolic profile of a Woods type lens which is dependent only on the mesh parameters. This technique could realize other exotic optical devices.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/1094-4087/ and http://www.opticsinfobase.org/submit/review/copyright_permissions.cfm#posting (accessed 28/02/2014).
Publisher:	Optical Society
ISSN:	1094-4087
Date of First Compliant Deposit:	30 March 2016
Last Modified:	10 Nov 2023 12:48
URI:	https://orca.cardiff.ac.uk/id/eprint/48636

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