Triangular resonator with surface plasmon resonance around the critical angle
- Triangular resonator with surface plasmon resonance around the critical angle
- Doo Gun Kim; Geum-Yoon Oh; Seon Hoon Kim; Hyun Chul Ki; Hyo Jin Kim; Hwe Jong Kim; 김재헌; Tae Kyung Chung; Young-Wan Choi
- triangular resonator; surface plasmon; resonance angle; chemical detection; toxic material
- Issue Date
- Journal of applied physics
- VOL 110, NO 7, 073107-1-073107-5
- 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.
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