Seminar: Plasmonic colour for security printing and chemical sensing

UK Metamaterials Network

Seminar on 'Plasmonic colour for security printing and chemical sensing' from Prof Alasdair Clark

O﻿n Tuesday 15th November, 1-2pm via Microsoft Teams, there will be a seminar on &#x27;Plasmonic colour for security printing and chemical sensing&#x27; from <a href="https://www.gla.ac.uk/schools/engineering/staff/alasdairclark/" target="_blank" data-msys-clicktrack="0" rel="nofollow noopener noreferrer">Prof Alasdair Clark</a>, Professor of Nanoscale Engineering at University of Glasgow, streaming live from St Andrews University. You will receive the Microsoft Teams link in your order confirmation email.Prof Clark will present two applications of his work in the field of plasmonic structural colour; a security labelling technology that relies on polarisation sensitive nano-apertures, and an artificial nano-tongue for chemical sensing.Security labelling:Using cross-shaped nano-apertures in a thin film of aluminum we demonstrate a method for patterning polarisation sensitive color images and codes at subwavelength resolutions. Each aperture is engineered to exhibit 2 plasmonic colors that can be individually tuned. This lets us encode 2 arbitrary information sets using a single nano-aperture array. We show that using a standard optical microscope, colour separation can be controlled down to 2x2 nano-pixels while retaining polarisation selectivity. Artificial Tongue:Our artificial tongue is composed of millions of nanoscale ‘taste-buds’. Made from Au and Al, these taste-buds provide a plasmonic response that is highly dependent on the refractive index of the liquid that surrounds them. Through specific modification of these plasmonic arrays with surface chemistries of varying hydrophobicity, we are able to segregate the molecular components within a liquid, measure the effect of these individual components on the plasmonic structures, and then provide a unique statistical score to each liquid.

Seminar: Plasmonic colour for security printing and chemical sensing

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Seminar: Plasmonic colour for security printing and chemical sensing

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