Review of surface plasmon resonance and localized surface plasmon resonance sensor

Photonic Sensors, Mar 2012

An overview of recent researches of surface plasmon resonance (SPR) sensing technology in Laboratory of Science and Technology of Micro-Nano Optics (LMNO), University of Science and Technology of China, is presented. Some novel SPR sensors, such as sensors based on metallic grating, metal-insulator-metal (MIM) nanoring and optical fiber, are designed or fabricated and tested. The sensor based on localized surface plasmon resonance (LSPR) of metallic nanoparticles is also be summarized. Because of the coupling of propagating surface plasmons and localized surface plasmons, the localized electromagnetic field is extremely enhanced, which is applied to surface-enhanced Raman scattering (SERS) and fluorenscence enhancement. Future prospects of SPR and/or LSPR sensing developments and applications are also discussed.

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Review of surface plasmon resonance and localized surface plasmon resonance sensor

Yong CHEN 0 1 Hai MING 0 1 Corresponding author: Hai MING 0 1 0 University of Science and Technology of China , Hefei, Anhui, 230026, China 1 Department of Optics & Optical Engineering, Anhui Key Laboratory of Optoelectronic Science and Technology An overview of recent researches of surface plasmon resonance (SPR) sensing technology in Laboratory of Science and Technology of Micro-Nano Optics (LMNO), University of Science and Technology of China, is presented. Some novel SPR sensors, such as sensors based on metallic grating, metal-insulator-metal (MIM) nanoring and optical fiber, are designed or fabricated and tested. The sensor based on localized surface plasmon resonance (LSPR) of metallic nanoparticles is also be summarized. Because of the coupling of propagating surface plasmons and localized surface plasmons, the localized electromagnetic field is extremely enhanced, which is applied to surface-enhanced Raman scattering (SERS) and fluorenscence enhancement. Future prospects of SPR and/or LSPR sensing developments and applications are also discussed. 1. Introduction Since the first application of surface plasmon resonance (SPR) phenomenon for gas detection and biologic sensor in 1982 [1], the SPR sensing technology has been widely used for the detection of biological and chemical analytes, environmental monitoring and medical diagnostics [25] in the past two decades. Surface plasmons (SPs) are coherent oscillations of free electrons at the boundaries between metal and dielectric which are often categorized into two classes: propagating surface plasmons (PSPs) and localized surface plasmons (LSPs) [6]. PSPs can be excited on the metallic films which have several approaches as the Kretschman [7] and Otto [8] prism coupler, optical waveguides coupler [9], diffraction gratings [10], and optical fiber coupler [11], whereas LSPs can be excited on metallic nano-particles, which both can induce a strong enhancement of electromagnetic filed in the near-field region (resonance amplification), leading to a extensive application in surface-enhanced Raman scattering (SERS) [12], fluorescence enhancement [13], refractive index (RI) measurement [14], biomolecular interaction detection [15], and so on. In this paper, we will review some recent works on SPR (based on PSPs) and localized surface plasmon resonance (LSPR) (based on LSPs) sensors at the Laboratory of Science and Technology of Micro-Nano Optics (LMNO) and make a prospect on the research and applications of SPR and LSPR sensors. 2. Current research activities on SPR and LSPR sensors at LMNO Our research works are focused on new-style SPR sensors, bimetallic sensor chip for Kretschmann configuration, optical fiber SPR sensors and LSPR sensors on SERS and fluorescence enhancement. 2.1 Novel-style SPR sensors Two types of SPR sensors with different styles are designed: metallic grating SPR sensor [16] and racetrack resonator SPR sensor [17]. Metallic grating SPR sensor has a high sensitivity for gas detection, and racetrack resonator SPR sensor has a broad linear detection range of analyte RI and high extinction ratio. 2.1.1 Metallic grating SPR sensor We designed a highly sensitive grating-based SPR sensor for the gas detection [16]. The sensor has a high sensitivity at larger resonant incident angle if negative diffraction order of metallic grating is used to excite the surface plasmons, as shows in Fig. 1. Detector Light source where m is the permittivity of the metal, res is the resonant angle of incidence, na is the RI of analyte, m is an integer representing the diffraction order, and sign + and sign - correspond to m0 and m0, respectively. The sensitivity (dres/dn) of the resonant angle of 0 20 40 60 80 100 Angle of incidence, (degree) Fig. 3 Reflectance spectra of rectangle-grating-based SPR sensors with different analyte refractive indices [18]. The sensitivity of the metallic-grating-based SPR sensor can be improved by using double-dips method [18]. As shown in Fig. 3, when the RI of the grating-based SPR sensors depends on the resonant incident angle (Fig. 2). The sensitivity of the negative diffraction order(m0) is tens of times higher than that of positive diffraction order (m0) at large resonant angle, which is also much higher than that of conventional prism-based SPR sensor. For hydrogen detection, a thin Pd film is deposited on the metallic grating. When the Pd-coated gold grating is exposed to hydrogen with different concentrations, the permittivity of Pd layer will change. Then the change in the resonant angle can be detected. The theoretical resolution of hydrogen concentration of the order of 0.001% is obtained according to our design. 0 0 10 20 30 40 50 60 70 80 90 Resonant angle (degree) Fig. 2 Sensitivity of the resonant angle of grating-based SPR sensors versus the resonant angle of incidence (=850 nm, na=1.02) [16]. itvy0.6 i t c e lf eR0.4 ) IRU600 / e e r g (ed400 y t i v i t isn200 e S Ei2 w Ei1 analyte cha (...truncated)


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Yong Chen, Hai Ming. Review of surface plasmon resonance and localized surface plasmon resonance sensor, Photonic Sensors, 2012, pp. 37-49, Volume 2, Issue 1, DOI: 10.1007/s13320-011-0051-2