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Microwave-to-terahertz sensors: from 2D materials towards health and security applications

Speaker: 
Norbert Klein (Imperial College, London)
Date: 
Thu, 02/06/2016 - 11:00am to 12:00pm
Location: 
Physics Conference Room (S11-02-07)
Host: 
Goki Eda
Event Type: 
Seminars

Abstract

Passive microwave-to-terahertz resonators and transmission line structures offer a wide potential for contact-free material characterization and sensor applications. As an example, our semi-open dielectric loaded microwave cavities based in functional ceramics have been successfully commercialized for liquid explosive detection in passenger checkpoints, and are still in use for our research, for example as biosensor for accurate haemoglobin measurements on sub-microlitre blood samples and as method for contact-free characterization and quality assessment of large area graphene layers and FET structures. At terahertz frequencies, our photonic bandgap and spoof plasmon structures have been successfully used for nanolitre bioliquid detection, aiming towards label-free cancer cell detection within microfluidic lab-on-chip systems. Graphene has a huge potential to be used as material for THz modulators and detectors, potentially enabling low-cost THz communication and imaging systems. First results with transparent microwave modulators based on large-area self-gated transparent G-FET structures will be presented. In combination with graphene as biointerface, the microwave-to-terahertz frequency range offers challenging opportunities for sensor applications within health and security.

About the speaker

Prof. Norbert Klein is Professor for Electromagnetic Materials and Sensors in the Department of Materials at Imperial College London. He is founder and Director of Imperial’s Centre for Terahertz Science and Engineering and he spun out a company which successfully commercializes microwave sensor systems for airport security (www.emisens.com). Prof. Klein is author or more than 160 publications in science- and engineering journals and he holds a large number of patents in microwave/ THz sensor and communication technology. His current research comprises label-free electromagnetic biochemical sensors including microfluidics, electromagnetic material characterization and graphene device fabrication and device physics.

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