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Broadband line imaging with subwavelength resolution using plasmonic waveguides

Broadband line imaging with subwavelength resolution using plasmonic waveguides
Broadband line imaging with subwavelength resolution using plasmonic waveguides
In this paper we design a high-resolution line imaging device allowing for broadband operation at near-infrared wavelengths ranging from 1 µm to 2 µm utilizing the advantage of subwavelength light confinement in plasmonic waveguides. The device consists of an array of air-guided plasmonic waveguides in gold with fanned-out geometry. In the main part of the device the separation between waveguides increases gradually from the input towards the output. High resolution is achieved on the input side by tapering down the periodicity between channels to 150 nm, while simultaneously maintaining propagation losses of a few dB. The proposed design also minimizes optical cross-coupling between waveguides; each channel thus transmits optical fields independently allowing for high signal-to-noise ratio imaging. At the low-resolution side properly tailored output couplers are designed to enhance optical coupling to free space. This is also shown to be an effective method to reduce back reflection, thus minimizing Fabry-Perot effects in the waveguides and allowing for broadband operation.
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Horak, P.
520489b5-ccc7-4d29-bb30-c1e36436ea03
Prangsma, J.C.
280f81ad-a2dc-472d-8ce1-d276572b18b7
Pinkse, P.W.H.
6ae387f8-dcb5-4ecf-acd7-6af4849b328c
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Horak, P.
520489b5-ccc7-4d29-bb30-c1e36436ea03
Prangsma, J.C.
280f81ad-a2dc-472d-8ce1-d276572b18b7
Pinkse, P.W.H.
6ae387f8-dcb5-4ecf-acd7-6af4849b328c

Podoliak, Nina, Horak, P., Prangsma, J.C. and Pinkse, P.W.H. (2015) Broadband line imaging with subwavelength resolution using plasmonic waveguides. PIERS '15: Progress in Electromagnetics Research Symposium. 06 - 09 Jul 2015.

Record type: Conference or Workshop Item (Paper)

Abstract

In this paper we design a high-resolution line imaging device allowing for broadband operation at near-infrared wavelengths ranging from 1 µm to 2 µm utilizing the advantage of subwavelength light confinement in plasmonic waveguides. The device consists of an array of air-guided plasmonic waveguides in gold with fanned-out geometry. In the main part of the device the separation between waveguides increases gradually from the input towards the output. High resolution is achieved on the input side by tapering down the periodicity between channels to 150 nm, while simultaneously maintaining propagation losses of a few dB. The proposed design also minimizes optical cross-coupling between waveguides; each channel thus transmits optical fields independently allowing for high signal-to-noise ratio imaging. At the low-resolution side properly tailored output couplers are designed to enhance optical coupling to free space. This is also shown to be an effective method to reduce back reflection, thus minimizing Fabry-Perot effects in the waveguides and allowing for broadband operation.

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Published date: 2015
Venue - Dates: PIERS '15: Progress in Electromagnetics Research Symposium, 2015-07-06 - 2015-07-09
Organisations: Optoelectronics Research Centre, Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 378975
URI: https://eprints.soton.ac.uk/id/eprint/378975
PURE UUID: b808aeac-5416-4b2a-a48b-fc2031d7086c
ORCID for Nina Podoliak: ORCID iD orcid.org/0000-0002-3146-0355
ORCID for P. Horak: ORCID iD orcid.org/0000-0002-8710-8764

Catalogue record

Date deposited: 15 Jul 2015 16:12
Last modified: 30 Nov 2018 01:34

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