Chinese Optics Letters, 2014, 12 (s1): S12403, Published Online: Jul. 31, 2014
All-optical sensor based on surface plasmon polaritons in multi-layers metal-dielectric structure Download: 760次
240.6680 Surface plasmons 120.4570 Optical design of instruments 130.3120 Integrated optics devices 230.1150 All-optical devices
Abstract
We study all-optical sensing characteristics based on long-range surface plasmon resonance in a four-layered metal-dielectric structure immersed in the liquid to be measured. The resonance peaks in the reflection angle spectra depend on different refractive indices from 1.30 to 1.38, which are calculated and compared in three typical wavelengths of 532, 632.8 and 780 nm, respectively. Compared with 532 nm, the incident light of 780 nm results in an unstable sensing stability, but the resolution enhances two times. The sensitivity of this refractive index sensor at an incident angle of 45° is about 236.7 nm/RIU which uses 532-nm laser as the light source.
Jin Li, Yundong Zhang, Hanyang Li, Chengbao Yao, Ping Yuan. All-optical sensor based on surface plasmon polaritons in multi-layers metal-dielectric structure[J]. Chinese Optics Letters, 2014, 12(s1): S12403.