Photoacoustic plasmon resonance spectra of Langmuir-Blodgett films

Abstract

Abstract:The surface plasmon spectra of Langmuir-Blodgett (LB) films have been investigated by combining photoacoustic technique with resonant attenuated total reflection spectroscopy. By this technique, the experimental PA angular spectra of cadmium stearate LB films have been obtained. According to the electromagnetic theory and considering the anisotropic properties of LB films, as well as based on the experimental photoacoustic plasma resonance curves, we have determined the optical constants and thicknesses of the films by using numerical optimization method.

Controlled Growth of the Ordered Cadmium Sulfide Particulate Films and the Photoacoustics Investigation

“…The PAS measurement was based on a single-beam photoacoustic spectroscopy system . An intensity-modulated beam of monochromatic light from xenon was illuminated on CdS films placed in a closed cell.…”

“…Because of the quantum size effect of nanoparticles, the UV−visible absorption spectroscopy method has become a powerful tool to investigate the nanosystems. , Compared with the UV−vis spectroscopy, photoacoustic spectroscopy (PAS) is more sensitive and accurate for weak optical absorption. − So the PAS method can be used to study the electronic and optical properties of the CdS particulate films in detail. PAS shows that these two kinds of CdS particulate films are size-quantized.…”

Photoacoustic measurement of refractive index of dye solutions and myoglobin for biosensing applications

“…Several groups [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43] used this approach to understand the technique and to detect various materials, such as nicotine, and various gases of interest. The optical setups varied significantly, however, these methods generally used a laser pulse not meeting the excitation requirement for thermal confinement in the samples of interest.…”

Photoacoustic evaluation of surfaces via pulsed evanescent field interaction

“…In this way, SPRPAS, increases the sensitivity of the TIRPAS technique by measuring the non-radiative decay of the surface plasmons that form into an acoustic wave for detection. The SPRPAS technique has been used for the fundamental investigation of surface plasmons [67][68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84], for the measurement of Langmuir-Blodgett films [85,86], and for the detection of nicotine in cigarette smoke [87].…”

“…Another method, related to TIRPAS, was explored in the early 1980s that used the resonant effect of surface plasmons to induce a photoacoustic effect for the detection of materials at an interface as well. Several groups [67][68][69][70][71][72][73][74][79][80][81][82][83][84][85][86][87] used this approach to understand the technique and to detect various materials, such as nicotine, and various gases of interest. The optical setups varied substantially, however, these methods generally used a laser pulse not meeting the excitation requirement for thermal confinement in the samples of interest.…”