A Gold-Deposited Surface Plasmon Resonance-based Optical Fiber Sensor System Using Various Light-Emitting Diodes

Abstract

The performance of a simple gold (Au)-deposited optical fiber sensor system based on surface plasmon resonance (SPR) is presented. Our sensor system comprises a light-emitting diode (LED) and a photodiode (PD) as the light source and the detector, respectively. The response curves and sensor properties of the Au-deposited optical fiber with a Au film thickness of 45 nm obtained by using three LEDs with 563, 660, and 940 nm emissions were investigated. The sensor properties depend strongly on the wavelength of the incident light and can be controlled by changing the LED emission wavelength. The response curves of the sensor obtained at the three wavelengths and calculated using SPR theoretical equations were compared with those obtained by experimentation. Our sensor system represents a new SPR-based refractometer with performance almost equal to that of an Abbe refractometer. To demonstrate its usefulness, ethanol concentrations in various spirits were measured and the results compared with those as labeled.

Molecular selectivity development of Teflon® AF1600-coated gold-deposited surface plasmon resonance-based glass rod sensor

“…The Au film with a thickness of 45 nm was deposited on half of the clean silicate glass rod (2 mm diameter × 140 mm long, Vidtec, Fukuoka, Japan) by Au (>99.99%, Ishifuku Metal, Tokyo, Japan) evaporation at a rate of 1.0 nm/s in a high vacuum (<610 −4 Pa) at room temperature. The Au film deposited on the glass rod has a geometrical thickness distribution in which the maximum value (45 nm) represents the deposited metal thickness [35][36][37][38][39][40][41][42][43]. The uncertainty of the Au film thickness was less than 0.3 nm.…”

“…We previously developed a small and simple Au-deposited multimode optical fiber sensor, in which the light intensity of a He-Ne laser (632.8 nm) that was transmitted through the sensor was measured without scanning of the wavelength or variation of the angle of incidence of the light [29][30][31][32][33][34][35][36][37][38][39][40]. Another simple sensor system using Au-deposited glass rods with diameters of 1-4 mm and deposition lengths of 10-100 mm equipped with a light-emitting diode (LED) has also been presented [41,42].…”

“…Another simple sensor system using Au-deposited glass rods with diameters of 1-4 mm and deposition lengths of 10-100 mm equipped with a light-emitting diode (LED) has also been presented [41,42]. The response properties of these metal-deposited optical fiber and glass rod sensors could be controlled by varying the metal thickness [32][33][34][35]40], the type of metal used [36][37][38]40], and the incident light wavelength [39][40][41]. Recently, we have developed a Teflon AF1600-coated Au-deposited SPR-based optical fiber sensor [43].…”

Separation and Detection of Hydrocarbons and Gasoline in Automotive Engine Oil Using a Teflon® AF2400-coated Golddeposited Surface Plasmon Resonance-based Glass Rod Sensor

“…The response characteristics of the metal-deposited SPR optical fiber and glass rod-type sensors can be controlled by varying the wavelength of the incident LED light. 32,33 The refractivities of the SPR sensing region when it contained a hydrocarbon on the Au film of the Au-deposited SPR glass rod sensor that was coated with the PEG thiol spacer layer and the Teflon AF2400 overlayer were estimated based on their responses to three LEDs with different operating wavelengths. Figure 5 shows the typical response curves of the Au-deposited SPR glass rod sensor when coated with the spacer layer and the Teflon selective layer that were measured using LEDs with operating wavelengths of 591 nm (yellow) and 934 nm (infrared) to concentrations ranging from 0 to 10%, w/w of hexane in commercial engine oil.…”

Ammonia Gas Detection under Various Humidity Conditions Using Waveguide Surface Plasmon Resonance Spectroscopy

“…Therefore, a surface plasmon resonance (SPR) technique is frequently employed in the development of sensitive sensors of bio-and gas-molecular adsorptions. [14][15][16][17][18][19] SP is a coupling mode of a light and corrective oscillation of surface free electrons, and the SP excitation condition must be fulfilled for observation. SP excitation is commonly conducted by a Kretschmann configuration, 1 like a glass prism, metal film, and dielectric film structure.…”