Program

O.19 -- Oral, NCTP-40

Date: Wednesday, 29 July 2015

Time: 15h00 - 15h20

High quality factor in 2D photonic crystal L3 nanocavities on silicon-on-insulator

Thi-Phuong Ngo, Anh-Nguyet T. Nguyen, Tieu-Khanh Ngo

HCM University of Pedagogy

We report on the numerical and experimental analysis of high-quality factor (Q) two-dimensional photonic crystal L3 nanocavities. Ge/Si quantum dots are embedded as active internal sources inside the photonic crystal slab. Cavities in this configuration operate around 1550 nm, i.e. telecommunication wavelength. A strong luminescence signal enhancement by two orders of magnitude associated with the islands embedded in the nanocavities is observed. We focus on optimizing the quality factor of L3 nanocavities by modifying the hole position at the edges of the nanocavity. High Q > 75000 is obtainable by optimization of structural parameters based on the FDTD calculation. The maximum Q-factor measured is limited by the spectrometer resolution. We conclude by outlining the mix of optical properties and structure parameters needed to open up the further research directions.

Presenter: Ngô Thị Phương