[6a-S44-1~10] 9.2 Nanowires and Nanoparticles

▲ [6a-S44-6] Silver Nanoprisms Enhanced Propagating Surface Plasmon Resonance on Silver Grating Structure Detected by Transmission Surface Plasmon Resonance
Imaging Technique

〇Chutiparn Lertvachirapaiboon, Akira Baba¹, Sanong Ekgasit², Kazunari Shinbo¹, Keizo Kato¹, Futao Kaneko¹ (1.Niigata Univ., 2.Chulalongkorn Univ.)

Keywords:Transmission surface plasmon resonance, silver nanoprisms, TSPR image

Transmission surface plasmon resonance (TSPR) is a phenomenon involving an extraordinary transmission of light through plasmonic metal-coated nanohole arrays and grating structures. The enhanced electric field associated with TSPR is highly sensitive to the local dielectric condition at the metal interface and can be observed by conventional spectroscopy and imaging technique. Hence, TSPR technique has been employed for several biosensor applications. In this study, we further facilitated and tuned the electric field at the silver grating/dielectric interface of silver grating substrate using silver nanoprisms (AgNPrs). The TSPR image and TSPR signal of this hybrid material were recorded using a camera coupled with liquid crystal tunable filters.An obvious increase in TSPR intensity and a redshift of the TSPR peak position were observed when AgNPrs were deposited onto the silver grating substrate. These results indicated that the plasmon excitation of TSPR could be facilitated and further excited by LSPR of the AgNPrs. A darker TSPR image with the decrease in TSPR intensity at the wavelength of 720 nm from 2471.8 to 1079.2 counts was detected by camera with liquid crystal tunable filters. The decreasing in TSPR signal after deposition of AgNPrs was due to the shifting of TSPR peak to longer wavelength. This hybrid material can be exploited in hydrogen peroxide sensor, glucose sensor, and cholesterol sensor applications.