We report on a unique annular aperture detection scheme in radially polarized coherent anti-Stokes Raman scattering
(RP-CARS) microscopy to effectively remove the solvent background for high contrast vibrational imaging. Our
finite-difference time-domain (FDTD) calculations show that the far-field RP-CARS radiation from the scatterer with
size comparable to the excitation wavelength is stronger than that from the solvent at large cone angles (around 45° to
150°). The annular detection provides about one order higher contrast for both forward and backward detected RP-CARS
microscopy.
The modeling for investigating the thermal effect on slider in heat assisted magnetic recording is built and its verification
is conducted by comparing the simulation results and experiment results. The temperature distribution on the slider
induced by locally heated media in 1Tb/in2 is simulated and the results show that the effect is within a very small zone
on the bottom surface. The temperature changes on other surfaces are less than 0.1°C, which can be negligible.
Different definitions of spot size and depth of focus in optical data storage systems are analyzed and compared numerically. It appears that the differences between the definitions become more significant as the numerical aperture of the optical system increases. The relationship between spherical aberration and axial intensity is studied, and a general definition of the depth of focus based on this analysis is proposed.
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