| .Adaptive optical design in surface plasma resonance sensor[J].Optoelectronics Letters,2006,2(1):31-33 |
| Adaptive optical design in surface plasma resonance sensor |
| ZHANG Feng ZHONG Jin-gang |
| Institute of Optoelectronic Engineering, Jinan University, Guangzhou 510632, China |
| Abstract: |
| A double-prism adaptive optical design in surface plasma resonance (SPR) sensor is proposed, which consists of two identical
isosceles right-triangular prisms. One prism is used as a component of Kretschmann configuration, and the other is for regulation
of the optical path. When double-prism structure is angle-scanned by an immovable incident ray, the output ray will be always
parallel with the incident ray and just has a small displacement with the shift of output point. The output ray can be focused
on a fixed photodetector by a convex lens. Thus it can be avoided that a prism and a photodetector rotate by θ and 2θ respectively
in conventional angular scanning SPR sensor. This new design reduces the number of the movable components, makes the structure
simple and compact, and makes the manipulation convenient. |
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