Simulation of Thermal Processes in Metamaterial MM-to-IR Converter for MM-wave Imager

The main characteristics of MM-wave image detector were simulated by means of accurate numerical modelling of thermophysical processes in a metamaterial MM-to-IR converter. The converter represents a multilayer structure consisting of an ultra thin resonant metamaterial absorber and a perfect emissi...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-01, Vol.490 (1), p.12174-4
Main Authors: Zagubisalo, Peter S, Paulish, Andrey G, Kuznetsov, Sergey A
Format: Article
Language:English
Subjects:
Absorbers
Absorbers (materials)
Computer simulation
Converters
Detectors
Emission
Emissivity
Energy conversion efficiency
Image detection
Infrared radiation
Linear functions
Mathematical models
Metallizing
Metamaterials
Micrometers
Millimeter waves
Multilayers
Numerical models
Optimization
Physics
Radiation
Real time operation
Simulation
Thermal simulation
Thermophysical models
Thickness
Time response
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Summary:The main characteristics of MM-wave image detector were simulated by means of accurate numerical modelling of thermophysical processes in a metamaterial MM-to-IR converter. The converter represents a multilayer structure consisting of an ultra thin resonant metamaterial absorber and a perfect emissive layer. The absorber consists of a dielectric self-supporting film that is metallized from both sides. A micro-pattern is fabricated from one side. Resonant absorption of the MM waves induces the converter heating that yields enhancement of IR emission from the emissive layer. IR emission is detected by IR camera. In this contribution an accurate numerical model for simulation of the thermal processes in the converter structure was created by using COMSOL Multiphysics software. The simulation results are in a good agreement with experimental results that validates the model. The simulation shows that the real time operation is provided for the converter thickness less than 3 micrometers and time response can be improved by decreasing of the converter thickness. The energy conversion efficiency of MM waves into IR radiation is over 80%. The converter temperature increase is a linear function of a MM-wave radiation power within three orders of the dynamic range. The blooming effect and ways of its reducing are also discussed. The model allows us to choose the ways of converter structure optimization and improvement of image detector parameters.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/490/1/012174