Optimizing detection methods for terahertz bioimaging applications
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Authors
Karunasiri, Gamani
Grbovic, Dragoslav
Karanasiou, Irene S.
Bolakis, Christos
Uzunoglu, Nikolaos
Subjects
microbolometer
bioimaging
fine-tuned absorber
fingerprint
terahertz
bioimaging
fine-tuned absorber
fingerprint
terahertz
Advisors
Date of Issue
2015-06
Date
Publisher
SPIE
Language
Abstract
We propose a new approach for efficient detection of terahertz (THz) radiation in biomedical imaging applications. A double-layered absorber consisting of a 32-nm-thick aluminum (Al) metallic layer, located on a glass medium (SiO2) of 1 mm thickness, was fabricated and used to design a fine-tuned absorber through a theoretical and finite element modeling process. The results indicate that the proposed low-cost, double-layered absorber can be tuned based on the metal layer sheet resistance and the thickness of various glass media. This can be done in a way that takes advantage of the diversity of the absorption of the metal films in the desired THz domain (6 to 10 THz). It was found that the composite absorber could absorb up to 86% (a percentage exceeding the 50%, previously shown to be the highest achievable when using single thin metal layer) and reflect <1% of the incident THz power. This approach will enable monitoring of the transmission coefficient (THz transmission fingerprint) of the biosample with high accuracy, while also making the proposed double-layered absorber a good candidate for a microbolometer pixel’s active element.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10 .1117/1.OE.54.6.067107
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
8 p.
Citation
Bolakis, Christos, et al. "Optimizing detection methods for terahertz bioimaging applications." Optical Engineering 54.6 (2015): 067107.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.