Gapless surface states on topological insulators are protected from elastic scattering on nonmagnetic impurities which makes them promising candidates for low-power electronic applications. However, for widespread applications, these states should have to remain coherent at ambient temperatures. Here, we studied temperature dependence of the electronic structure and the scattering rates on the ...

We present a novel technique, intrinsic Raman spectroscopy (IRS), to correct turbidity-induced Raman spectral distortions, resulting in the intrinsic Raman spectrum that would be observed in the absence of scattering and absorption. We develop an expression relating the observed and intrinsic Raman spectra through diffuse reflectance using the photon migration depiction of light transport. Nume...

Single-wall carbon nanotubes can be probed optically by elastic light scattering. This effect forms the basis of a technique, termed Rayleigh scattering spectroscopy, for the study of individual nanotubes. Spectroscopic information on the electronic transitions of both semiconducting and metallic nanotubes is obtained by measuring the elastic scattering cross section as a function of photon ene...

Fiber-optic, polarized elastic-scattering spectroscopy techniques are implemented and demonstrated as a method for determining both scatterer size and concentration in highly scattering media. Measurements of polystyrene spheres are presented to validate the technique. Measurements of biological cells provide an estimate of the average effective scatterer radius of 0.5-1.0 mum. This average eff...

We describe a straightforward and highly visual experiment designed to demonstrate Raman scattering spectroscopy by measuring the vibrational energy spacing of nitrogen molecules in the liquid phase. Interpretation of the spectrum teaches the principles of elastic and inelastic light scattering and the intrinsic properties of molecules. The use of a pulsed Nd:YAG laser with high peak power lead...

UNLABELLED The aim of this review article is to compare findings from recent prospective studies on microendoscopy, fluorescence spectroscopy (FS) and elastic scattering spectroscopy (ESS) with histopathology on formalin-fixed surgical specimens, to assess if those techniques can be used as an adjunct or alternative to histopathology in defining tissue involvement. CLINICAL RELEVANCE These ar...

Optical diagnostics have proved to be a reliable resource that can be used to provide an instant diagnosis of soft and, more recently, hard tissue diseases. In the field of head and neck malignancy, most of the experimental spectroscopy work has been performed using fluorescence spectroscopy, Raman spectroscopy, elastic scattering spectroscopy, microendoscopy and optical coherence tomography. T...

One of the major frontiers in biomedical optics has been as an adjunct to gastrointestinal endoscopy. In particular, spectroscopy of elastic light scattering has the potential of addressing many of the vexing challenges confronting endoscopists. This review discusses the principles of spectroscopy and critically evaluates performance in clinically significant scenarios. One of the best establis...

This Letter reports on work performed to locate and interrogate a nonlinear scatterer in a linearly elastic medium through the use of a time reversal mirror in combination with nonlinear dynamics. Time reversal provides the means to spatially and temporally localize elastic energy on a scattering feature while the nonlinear dynamics spectrum allows one to determine whether the scatterer is nonl...