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Fabrication of nanostructured transmissive optical devices on ITO-glass with UV1116 photoresist using high-energy electron beam lithography

Accepted version
Peer-reviewed

Type

Article

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Authors

Bartholomew, R 
Rughoobur, G 
Gordon, GSD 
Flewitt, AJ 

Abstract

High-energy electron beam lithography for patterning nanostructures on insulating substrates can be challenging. For high resolution, conventional resists require large exposure doses and for reasonable throughput, using typical beam currents leads to charge dissipation problems. Here, we use UV1116 photoresist (Dow Chemical Company), designed for photolithographic technologies, with a relatively low area dose at a standard operating current (80 kV, 40-50 μC cm−2, 1 nAs−1) to pattern over large areas on commercially coated ITO-glass cover slips. The minimum linewidth fabricated was ∼33 nm with 80 nm spacing; for isolated structures, ∼45 nm structural width with 50 nm separation. Due to the low beam dose, and nA current, throughput is high. This work highlights the use of UV1116 photoresist as an alternative to conventional e-beam resists on insulating substrates. To evaluate suitability, we fabricate a range of transmissive optical devices, that could find application for customized wire-grid polarisers and spectral filters for imaging, which operate based on the excitation of surface plasmon polaritons in nanosized geometries, with arrays encompassing areas ∼0.25 cm2.

Description

Keywords

nanofabrication, electron beam lithography, UV1116, insulating substrate, plasmonics, transmissive optical devices

Journal Title

Nanotechnology

Conference Name

Journal ISSN

0957-4484
1361-6528

Volume Title

27

Publisher

Institute of Physics
Sponsorship
Engineering and Physical Sciences Research Council (EP/L015455/1)
EPSRC (1241027)
EPSRC Integrated Photonics and Electronic Systems (Grant number: EP/L015455/1) Centre for Doctoral Training. Commonwealth, European and International trust.