Simulation Design for Nano sensor and Signal Processing Devices based on Whispering Gallery Mode

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560071
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Engineering fundamentals
• Research Institution: University of Tsukuba
• Principal Investigator: COLE James B 筑波大学, システム情報系, 准教授 (20280901)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: silver nanorods / metamaterial / whispering gallery mode / recursive convolution / FDTD / time-reversed FDTD

Outline of Final Research Achievements

*We investigated WGM resonances for dielectrics of different shapes(such as cylindrical, elliptical, square, and triangular).We found that cylindrical resonators have the best optical properties for fabricating practical devices. *We computed the optical properties of different arrays of silver nanorods(10-20 nm in diameter, spacing 20-50 nm) in the visible wavelengths(400-700) nm, where the real part of the electrical permittivity is negative and the rods are thus effectively a metamaterial. We found that by adjusting the spacing and diameter linear arrays oriented perpendicular to the incident light beam (assumed to be Gaussian)the transmitted wavelength can be finely controlled with very low losses.*Some of them were implemented on a supercomputer.*We devised an optimization method to better represent curved boundaries on a rectangular grid .*We improved the calculation accuracy by using a new source model.*We have verified a discrete Green's function computational methodology.

Free Research Field

Nano-optical simulation and design using NS-FDTD