Open AccessThermally tunable silicon racetrack resonators with ultralow tuning power
Author(s) -
Po Dong,
Wei Qian,
Hong Liang,
Roshanak Shafiiha,
Dazeng Feng,
Guoliang Li,
J. E. Cunningham,
Ashok V. Krishnamoorthy,
Mehdi Asghari
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.020298
Subject(s) - resonator , materials science , silicon , undercut , optoelectronics , free spectral range , optics , multiplexing , hybrid silicon laser , silicon photonics , wavelength , electronic engineering , physics , engineering , composite material
We present thermally tunable silicon racetrack resonators with an ultralow tuning power of 2.4 mW per free spectral range. The use of free-standing silicon racetrack resonators with undercut structures significantly enhances the tuning efficiency, with one order of magnitude improvement of that for previously demonstrated thermo-optic devices without undercuts. The 10%-90% switching time is demonstrated to be ~170 µs. Such low-power tunable micro-resonators are particularly useful as multiplexing devices and wavelength-tunable silicon microcavity modulators.