Abstract
Dual Window Phenomenon for Surface Plasmon Resonance Sensor Based on Plastic Optical Fiber
Highlights
Surface plasmon resonance (SPR)-based sensors have been used in a wide range of physical,(1) chemical,(2,3) and biological sensing schemes.[4,5] The German physicist Kretschmann used a prism substrate covered with a metal thin film of several tens of nanometers thickness to achieve surface plasmon resonance (SPR) detection.[6]. Thereafter, SPR technology started to develop rapidly
The absorption of PMMA is mainly caused by the asymmetrical bending vibration of a methyl group (CH3) and a carbonyl group, which leads to the absorption band and must be avoided when utilizing a plastic optical fiber (POF).[2]. In Fig. 4, the transmission spectrum of the POF was measured and compared with that of an M74L01 glass optical fiber (GOF; Thorlabs) with a core diameter of 400 μm, which is only about half that of the POF, so the overall transmission light intensity of the POF is much higher than that of the GOF
The red shift in the SPR wavelength with increasing refractive index of analytes is similar to the results presented in Ref. 21
Summary
Surface plasmon resonance (SPR)-based sensors have been used in a wide range of physical,(1) chemical,(2,3) and biological sensing schemes.[4,5] The German physicist Kretschmann used a prism substrate covered with a metal thin film of several tens of nanometers thickness to achieve SPR detection.[6] Thereafter, SPR technology started to develop rapidly. Silica optical fibers are fragile and difficult to handle during surface modification processes to realize biosensors. POFs have a more flexible, effective, and robust performance in sensing and a higher biocompatibility.[16,18] In this work, a gold thin film was deposited on a side-polished POF, and wavelength monitoring was performed for a wide range of wavelengths. To the best of our knowledge, this is the first paper to discuss a dual-window SPR sensor
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