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Your search keyword '"Gehan Amaragtunga"' showing total 3 results
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3 results on '"Gehan Amaragtunga"'

1. Ultrasmall microlens array based on vertically aligned carbon nanofibers

Author

Ranjith Rajasekharan, Gehan Amaragtunga, Haider Butt, Xiaohui Qiu, Timothy D. Wilkinson, and Qing Dai

Subjects
Microlens, Materials science, business.industry, Carbon nanofiber, Nanophotonics, Physics::Optics, General Chemistry, Dielectric, Computer Science::Computational Complexity, Biomaterials, Optics, Liquid crystal, Computer Science::Logic in Computer Science, Electric field, Nanofiber, Electrode, General Materials Science, business, Biotechnology
Abstract

An ultrasmall tunable microlens with a diameter of 1.5 μm is fabricated using nematic liquid crystals (electrically tunable medium) and vertically aligned carbon nanofibers (CNFs, electrodes). Individual CNFs are grown at the center of circular dielectric regions. This allows the CNFs to produce a more Gaussian electric field profile and hence more uniformity in lens array switching.

Published
2012

2. Transparent liquid-crystal-based microlens array using vertically aligned carbon nanofiber electrodes on quartz substrates

Author

Xiaozhi Wang, Ranjith Rajasekharan, Haider Butt, Qing Dai, Gehan Amaragtunga, Timothy D. Wilkinson, and Kanghee Won

Subjects
Microlens, Materials science, Carbon nanofiber, Mechanical Engineering, Bioengineering, Nanotechnology, General Chemistry, Mechanics of Materials, Liquid crystal, Nanofiber, Electrode, Electrode array, General Materials Science, Electrical and Electronic Engineering, Quartz, Electron-beam lithography
Abstract

A novel transparent liquid-crystal-based microlens array has been fabricated using an array of vertically aligned multi-wall carbon nanofibers (MWCNFs) on a quartz substrate and its optical characteristics investigated. Electron beam lithography was used for the catalyst patterning on a quartz substrate to grow the MWCNF array of electrodes. The structure of the electrode array was determined through simulation to achieve the best optical performance. Both the patterned catalyst and growth parameters were optimized for optimal MWCNF properties. We report an in-depth optical characterization of these reconfigurable hybrid liquid crystal and nanofiber microlens arrays.

Published
2011
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3. Transparent liquid-crystal-based microlens array using vertically aligned carbon nanofiber electrodes on quartz substrates.

Author

Qing Dai, Ranjith Rajasekharan, Haider Butt, Kanghee Won, Xiaozhi Wang, Timothy D Wilkinson, and Gehan Amaragtunga

Subjects
LIQUID crystals, TRANSPARENCY (Optics), CARBON fibers, NANOSTRUCTURES, CARBON electrodes, MICROFABRICATION, ELECTRON beam lithography, SIMULATION methods & models
Abstract

A novel transparent liquid-crystal-based microlens array has been fabricated using an array of vertically aligned multi-wall carbon nanofibers (MWCNFs) on a quartz substrate and its optical characteristics investigated. Electron beam lithography was used for the catalyst patterning on a quartz substrate to grow the MWCNF array of electrodes. The structure of the electrode array was determined through simulation to achieve the best optical performance. Both the patterned catalyst and growth parameters were optimized for optimal MWCNF properties. We report an in-depth optical characterization of these reconfigurable hybrid liquid crystal and nanofiber microlens arrays. [ABSTRACT FROM AUTHOR]

Published
2011
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