Demonstration of chalcogenide glass racetrack microresonators.
We have demonstrated what we believe to be the first chalcogenide glass racetrack microresonator using a complementary metal-oxide semiconductor-compatible lift-off technique with thermally evaporated As(2)S(3) films. The device simultaneously features a small footprint of 0.012 mm x 0.012 mm, a cavity Q (quality factor) of 10,000, and an extinction ratio of 32 dB. These resonators exhibit a very high sensitivity to refractive index changes with a demonstrated detection capability of Dn(As(2)S(3)=(4.5 x 10(-6)+/-10%) refractive index unit. The resonators were applied to derive a photorefractive response of As(2)S(3) to lambda=550 nm light. The resonator devices are a versatile platform for both sensing and glass material property investigation.
Hu
Juejun
J
Microphotonics Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. hujuejun@mit.edu
Carlie
Nathan
N
Petit
Laeticia
L
Agarwal
Anu
A
Richardson
Kathleen
K
Kimerling
Lionel
L