Browsing by Author "Chung, Yi-Kuan"

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Broad Detecting Range of Objective-Based Surface Plasmon Resonance Sensor via Multilayer Structure
(2011-09-01)
Lan, Tzu-Hsiang
;
Chung, Yi-Kuan
;
Tien, Chung-Hao
;
光電工程學系
;
顯示科技研究所
The demand of pursuing higher resolution drives the instrumental development of a surface plasmon resonance (SPR) sensor to shift from Kretchmann to objective-based configuration. However, its maximum sensing refractive index is restricted by the numerical aperture of an objective lens. Based on the mode conversion, we proposed a multilayer structure to extend the detecting range up to 11% (from 1.28 to 1.42) for a 1.45 objective lens via a transformed SPR mode. This technique not only overcomes intrinsic constraint but also reduces the cost. (C) 2011 The Japan Society of Applied Physics
Plasmonic rainbow rings induced by white radial polarization
(2012-04-01)
Lan, Tzu-Hsiang
;
Chung, Yi-Kuan
;
Li, Jie-En
;
Tien, Chung-Hao
;
光電工程學系
This Letter presents a scheme to embed both angular/spectral surface plasmon resonance (SPR) in a unique far-field rainbow feature by tightly focusing (effective NA = 1.45) a polychromatic radially polarized beam on an Au(20 nm)/SiO2(500 nm)/Au(20 nm) sandwich structure. Without the need for angular or spectral scanning, the virtual spectral probe snapshots a wide operation range (n = 1-1.42; lambda = 400-700 nm) of SPR excitation in a locally nanosized region. Combined with the high-speed spectral analysis, a proof-of-concept scenario was given by monitoring the NaCl liquid concentration change in real time. The proposed scheme will certainly has a promising impact on the development of objective-based SPR sensor and biometric studies due to its rapidity and versatility. (C) 2012 Optical Society of America