Sheng Hsiung Chang, Professor
Research Introduction
Perovskite Optoelectronic Device Physics:
This topic focuses on investigating the working principles of optoelectronic devices with perovskite thin films as the active layer. Through the device fabrication, measurements, and the analysis of their optoelectronic characteristics, we aim to realize the practical applications of perovskite optoelectronic devices.
Numerical Simulation of Plasmonic Devices:
Electromagnetic numerical methods are used to investigate the propagation and resonance characteristics of surface plasmon polaritons (SPPs) supported in various metallic structures. These unique optical properties are then applied to integrated optics, solar cells, light-emitting diodes (LEDs), and sensing components.
Spectroscopic Measurement and Analysis Techniques:
By integrating various spectroscopic techniques into a single microscope system, linear and non-linear optical spectra of semiconductor materials can be measured. This includes transmission, reflection, photoluminescence, Raman scattering, two-photon excitation fluorescence (TPEF), and second-harmonic generation (SHG) spectra. Various physical models are further applied to analyze spectral features, enabling the characterization of thin-film properties such as refractive index, absorption coefficient, thickness, electrical conductivity, crystallinity, defects, crystal characteristics, and optical non-linear responses.
Silicon Photonics Waveguide Device Design:
Transcendental equations and electromagnetic numerical methods are used to simulate and design various optical waveguide based devices, such as 1x2 beam splitters, 1x8 beam splitters, temperature tunable beam splitters, polarization beam splitters, polarizers, directional coupler based devices, and wavelength selectors. The primary design objectives of the above mentioned optical waveguide based devices are to achieve broadband operations, compact footprints, low insertion losses, and high wavelength resolution.