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Analysis of a systematic error appearing as a periodic fluctuation in the frequency-domain absorption spectra of metamaterial absorbers

Title
Analysis of a systematic error appearing as a periodic fluctuation in the frequency-domain absorption spectra of metamaterial absorbers
Author
이영백
Issue Date
2017-06
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v. 25, no. 12, page. 13296-13304
Abstract
A metamaterial is a periodic structure which can he considered as an effective medium that exhibits an atypical response for a corresponding range of electromagnetic (EM) waves. For metamaterial absorbers (MMA) working in the CtHz regime, the frequency-domain-measurement setup consisting of two horn antennas connected to a network analyzer is widely used. "llbe absorption spectra obtained with this setup usually exhibits some periodic fluctuation (PF) across the entire range of measurement. Typically, this PF in the frequency-domain spectrum is ignored because it is distinct from major features and has a small amplitude. We have examined the PF through a finite-difference time-domain (FDTD) simulation in order to verify the validity of such assumption + We concluded that the Pt is caused by a part of FM wave radiated by an antenna (source), and directly propagating to another (detector), resulting in an ifiterference between this leaked EM wave and the one reflected from the sample. We have successfully reproduced the periodic fluctuation of the experimental spectra by FDTI) simulation. We examined the angle of incidence dependence. The amplitude increases because the amount of leaked EM waves increases, while the periodicity increases because the distance-between the two antennas increases, resulting in a shortened path difference. We conclude that the PF is a systematic error which ca:n be safely ignored+ (C) 2017 Optical Society of America
URI
https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-12-13296https://repository.hanyang.ac.kr/handle/20.500.11754/114469
ISSN
1094-4087
DOI
10.1364/OE.25.013296
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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