ISSN:
1662-9779
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Physics
Notes:
Ultrahigh-Quality microcavity with whispering-gallery-mode (WGM) is a new kind ofresonator with high quality. The evanescent wave of WGM plays an important role in surfaceenhanced Raman scattering (SERS). In this paper we study the relationship between couplingcoefficient and evanescent wave of the WGM and the coupling character difference between themicrosphere and the microstadium. Based on the finite-difference time-domain (FDTD), wecalculate the coupling coefficient of different substances (water, C2H5OH, CHCL3, olive oil, C6H6and CS2) with different dielectric constant and the mode volume ratio of the evanescent wave inmicrosphere and microstadium of the above substances in near field. The results show that (1) themode volume ratio of evanescent wave will decrease with the increasing of the coupling coefficient;(2) the microstadium has a higher coupling coefficient than the sphere one
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1375.pdf
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