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Type: Journal article
Title: Terahertz near-field imaging of dielectric resonators
Author: Lee, W.
Kaltenecker, K.
Nirantar, S.
Withayachumnankul, W.
Walther, M.
Bhaskaran, M.
Fischer, B.
Sriram, S.
Fumeaux, C.
Citation: Optics Express, 2017; 25(4):3756-3764
Publisher: Optical Society of America
Issue Date: 2017
ISSN: 1094-4087
Statement of
Wendy S. L. Lee, Korbinian Kaltenecker, Shruti Nirantar, Withawat Withayachumnankul, Markus Walther, Madhu Bhaskaran, Bernd M. Fischer, Sharath Sriram and Christophe Fumeaux
Abstract: As an alternative to metallic resonators, dielectric resonators can increase radiation efficiencies of metasurfaces at terahertz frequencies. Such subwavelength resonators made from low-loss dielectric materials operate on the basis of oscillating displacement currents. For full control of electromagnetic waves, it is essential that dielectric resonators operate around their resonant modes. Thus, understanding the nature of these resonances is crucial towards design implementation. To this end, an array of silicon resonators on a quartz substrate is designed to operate in transmission at terahertz frequencies. The resonator dimensions are tailored to observe their low-order modes of resonance at 0.58 THz and 0.61 THz respectively. We employ a terahertz near-field imaging technique to measure the complex near-fields of this dielectric resonator array. This unique method allows direct experimental observation of the first two fundamental resonances.
Rights: © 2017 Optical Society of America
RMID: 0030065127
DOI: 10.1364/OE.25.003756
Appears in Collections:Physics publications

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