Near-Field CARS with Micro- and Nano-Particle

Spatial dependence of coherent anti‐Stokes Raman scattering (CARS) intensity and spectra for a spherical particle are studied for different sizes, ranging from micrometers to nanometers. Effects of near field on the spectra are analyzed, showing potential application as nano‐sensor in microscopy and imaging. The results can be extended to an array of nanospheres.The CARS process has been developed into a versatile real‐time detection technique in spectroscopy and microscopy [1]. In particularly, backscattered ultra‐violet CARS implemented on LIDAR system [2] is promising for remote detection of molecular species present in hazardous biological aerosols with microscale dimension. In practice, the aerosols could be in any dimension. Thus, we need to know study a modified the setup of the CARS technique for reliable detection of chemicals in micro‐ and nano‐particles using near‐field effects.We have developed a nonlinear semiclassical microscopic theory to describe the CARS spectra for a particle composed of...