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Plasmon waveguides (PW) were prepared by coating sol-gel copolymer templated mesoporous Ti2 film on gold layer sputtered on glass substrate. The cross-sectional imaging with a scanning electron microscope indicates that the gold and mesoporous Ti2 films are 40 nm and 275 nm thick, respectively. The PW resonance wavelengths at different incident ang...
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Citations
... They reported that the directional signal emanating through the prism at 44.5°was~10× stronger than the Raman scattering signal on the air side. Qi and coworkers reported experimental [88,89] and calculated [90][91][92] directional Raman scattering from monolayers and waveguides. Neither Li nor Qi reported an experimentally measured SPP cone. ...
Total internal reflection (TIR) optical spectroscopies have been widely used for decades as non-destructive and surface-sensitive measurements of thin films and interfaces. Under TIR conditions, an evanescent wave propagates into the sample layer within a region approximately 50 nm to 2 μm from the interface, which limits the spatial extent of the optical signal. The most common TIR optical spectroscopies are fluorescence (i.e., TIRF) and infrared spectroscopy (i.e., attenuated total reflection infrared). Despite the first report of TIR Raman spectroscopy appearing in 1973, this method has not received the same attention to date. While TIR Raman methods can provide chemical specific information, it has been outshined in many respects by surface-enhanced Raman spectroscopy (SERS). TIR Raman spectroscopy, however, is garnering more interest for analyzing the chemical and physical properties of thin polymer films, self-assembled monolayers (SAMs), multilayered systems, and adsorption at an interface. Herein, we discuss the early experimental and computational work that laid the foundation for recent developments in the use of TIR Raman techniques. Recent applications of TIR Raman spectroscopy as well as modern TIR Raman instruments capable of measuring monolayer-sensitive vibrational modes on smooth metallic surfaces are also discussed. The use of TIR Raman spectroscopy has been on a rise and will continue to push the limits for chemical specific interfacial and thin film measurements.
Total internal reflection (TIR) Raman spectroscopy can extract the chemical and physical information from thin films and adsorbates
... 14 SPCE has been widely used in fluorescence imaging, 15 biochemical sensing, 16 and enhanced Raman spectroscopy. 17 Most SPR-based SPCE Raman spectroscopy only concentrates on the surface effect due to the small penetration depth (d) of the evanescent field. 18 However, in practical biochemical sensors, both surface effects and bulk effects exist in the solution. ...
Surface plasmon-coupled emission has been widely used in fluorescence imaging, biochemical sensing, and enhanced Raman spectroscopy. A self-referenced directional enhanced Raman scattering for simultaneous detection of surface and bulk effects by using plasmon waveguide resonance (PWR) based surface plasmon-coupled emission has been proposed and experimentally demonstrated. Raman scattering was captured on the prism side in Kretschmann-surface plasmon-coupled emission. The distinct penetration depths (δ) of the evanescent field for the transverse electric (TE) and transverse magnetic (TM) modes result in different detected distances of the Raman signal. The experimental results demonstrate that the self-referenced directional enhanced Raman scattering of the TE and TM modes based on the PWR can detect and distinguish the surface and bulk effects simultaneously, which appears to have potential applications in researches of chemistry, medicine, and biology.
