Triangular resonator with surface plasmon resonance around the critical angle

Title
Triangular resonator with surface plasmon resonance around the critical angle
Authors
Doo Gun KimGeum-Yoon OhSeon Hoon KimHyun Chul KiHyo Jin KimHwe Jong Kim김재헌Tae Kyung ChungYoung-Wan Choi
Keywords
triangular resonator; surface plasmon; resonance angle; chemical detection; toxic material
Issue Date
2011-10
Publisher
Journal of applied physics
Citation
VOL 110, NO 7, 073107-1-073107-5
Abstract
A novel triangular resonator with total internal reflection and attenuated total reflection (ATR) mirrors is proposed. The resonance characteristics are analyzed for the first time. The optimum gold thickness in the ATR mirror is 33 nm and the resonance angle is 17.777˚. Extinction ratio greater than 66 dB could be achieved with the appropriate choice of resonance angle and coupling ratios. The triangular ring resonator with an incident angle of 18 inside the resonator was also fabricated and measured. The resulting free spectral range of the resonator is approximately 0.85 nm near 1558 nm, and the on-off ratio was about 3.5 dB. These resonance characteristics of the triangular resonator are found to be useful in realizing bio=chemical sensors when the ATR mirror carries a special electromagnetic wave called a surface plasmon wave.
URI
http://pubs.kist.re.kr/handle/201004/40408
ISSN
0021-8979
Appears in Collections:
KIST Publication > Article
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