The study of photonic nanojets of the multi-layer core-shell microdisks

• Main Authors: Kai-Lung Hsiao, 蕭凱隆
• Other Authors: 劉承揚
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/9a3t5t

碩士 === 淡江大學 === 機械與機電工程學系碩士班 === 103 === The photonic nanojets generated by a laser source in three metal shells (gold, silver, and copper) each enclosing a polydimethylsiloxane microdisk are studied. Lasers of wavelengths 671 nm, 532 nm, and 405 nm are used as a light source for each microdisk. This study is divided into two parts—theoretical calculation, and experimentation. In theoretical calculations, the finite-difference time-domain method is used to simulate the intensity distribution of photonic nanojets at different metal shell, diameters, and incident wavelengths. The core microdisks are created using semiconductor manufacturing technologies. A sputtering system is used to plate metal shells on the dielectric core. The measurement of photonic nanojets in the core-shell microdisks is performed in experiment with a high sensitivity optical microscope system. A computer program is written to analyze the parameters of photonic nanojets, including radial shift, full width at half maximum, and decay length. The simulation results are compared with experimental data. The study found the photonic nanojet characteristics can be changed by different metal shell materials. In the future, this technique can be applied to high-resolution optical microscopes for observing nanoscale objects.