| Original Articles |
|
|
|
|
High Sensitivity Transmission-Type SPR Sensor by Using Metallic--Dielectric Mixed Gratings |
| WU Bin;WANG Qing-Kang |
| National Key Laboratory of Micro/Nano Fabrication Technology, Key Laboratory for Thin Film and Microfabrication Technology of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Shanghai Jiao Tong University, Shanghai 200240 |
|
| Cite this article: |
|
WU Bin, WANG Qing-Kang 2008 Chin. Phys. Lett. 25 1668-1672 |
|
|
|
Abstract We theoretically investigate transmission-type SPR sensors with novel metallic--dielectric mixed gratings by rigorous coupled-wave analysis (RCWA), compared to the conventional dielectric gratings based structure. It is found that the transmittance efficiency and the full width at half-maximum (FWHM) of the transmission curve can be modulated by increasing or decreasing the metallic part. Therefore, appropriate proportion of metal part will induce enhancement factor of sensor merit. Furthermore, this novel structure will also bring enhancement of resonant angle shift, which can be explained by plasmonic interpretation based on a surface limited increase of interaction
area and excitation of localized surface plasmons (LSPs). The proposed configuration has a wide range of potential applications not only as sensor but also other optical devices.
|
| Keywords:
42.25.Bs
42.25.Gy
52.35.Mw
|
|
|
Received: 28 January 2008
Published: 29 April 2008
|
|
| PACS: |
42.25.Bs
|
(Wave propagation, transmission and absorption)
|
| |
42.25.Gy
|
(Edge and boundary effects; reflection and refraction)
|
| |
52.35.Mw
|
(Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))
|
|
|
|
|
|
[1] Wood R W 1902 Proc. Phys. Soc. London 18 269
[2] Raether H 1988 Surface Plasmons on Smooth and Rough Surfacesand on Gratings (Berlin: Springer) p 2
[3] Kretschmann E and Raether H 1968 Z. Naturforsch. 232135
[4] Otto A 1968 Z. Phys. 216 398
[5] Haes A J and Van Duyne R P 2002 J. Am. Chem. Soc. 12410596
[6] Garcia N 1983 Opt. Commun. 45 307
[7] Park S, Lee G, Song S H. and Kim P S 2003 Opt. Lett. 28 1870
[8] Lenaerts C, Michel F, Tilkens B, Lion Y, and Renotte Y 2005 Appl. Opt. 44 6017
[9] Shen S, Forsberg E, Han Z H, and He S L 2007 J. Opt.Soc. Am. A 24 225
[10] Moharam M G and Gaylord T K 1986 J. Opt. Soc. Am. A 31780
[11] Byun K M, Kim S J, and Kim D 2005 Opt. Express 13 3737
[12] Byun K M, Kim S J, and Kim D 2006 Appl. Opt. 45 3382
[13] Palik E D 1985 Handbook of Optical Constants ofSolids (Orlando, FL: Academic) p 356 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
