Open AccessLow-loss and high-Q Ta_2O_5 based micro-ring resonator with inverse taper structure
Author(s) -
ChengLung Wu,
Bo-Tsang Chen,
Yuan-Yao Lin,
Wei-Chen Tien,
GongRu Lin,
YiJen Chiu,
YungJr Hung,
Ann-Kuo Chu,
Chao-Kuei Lee
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.026268
Subject(s) - resonator , materials science , optics , transmission loss , insertion loss , waveguide , transmission coefficient , coupling loss , helical resonator , annealing (glass) , coupling (piping) , amorphous solid , optoelectronics , transmission (telecommunications) , physics , telecommunications , optical fiber , crystallography , chemistry , composite material , computer science
A low-loss and high-Q Ta(2)O(5) based micro-ring resonator is presented. The micro-ring resonator and channel waveguide with core area of the 700 by 400 nm(2) were fabricated on amorphous Ta(2)O(5) thin films prepared by reactive sputtering at 300°C and post annealing at 650°C for 3 hours. The Ta(2)O(5) micro-ring resonator with a diameter of 200 μm was coupled to the channel waveguide with a coupled Q up to 38,000 at a 0.9 μm coupling gap. By fitting the transmission spectrum of the resonator, the extracted loss coefficient inside the ring cavity and transmission coefficient of TE mode were 8.1dB/cm and 0.9923, leading to the estimated unloaded Q of higher than 44,000. In addition, based on the cut-back method, the propagation loss and the coupling loss of Ta(2)O(5) channel waveguide with an inverse taper were 1.5dB/cm and 3.2 dB, respectively. The proposed Ta(2)O(5) technology offers an unique alternative for fabricating high performance guided wave devices, and may well lead to novel applications in photonic integrated circuits.