Position-squared coupling in a tunable photonic crystal optomechanical cavity
| Autor: | Paraiso, Taofiq K., Kalaee, Mahmoud, Zang, Leyun, Pfeifer, Hannes, Marquardt, Florian, Painter, Oskar |
|---|---|
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Phys. Rev. X 5, 041024 (2015) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevX.5.041024 |
| Popis: | We present the design, fabrication, and characterization of a planar silicon photonic crystal cavity in which large position-squared optomechanical coupling is realized. The device consists of a double-slotted photonic crystal structure in which motion of a central beam mode couples to two high-Q optical modes localized around each slot. Electrostatic tuning of the structure is used to controllably hybridize the optical modes into supermodes which couple in a quadratic fashion to the motion of the beam. From independent measurements of the anti-crossing of the optical modes and of the optical spring effect, the position-squared vacuum coupling rate is measured to be as large as 245 Hz to the fundamental in-plane mechanical resonance of the structure at 8.7MHz, which in displacement units corresponds to a coupling coefficient of 1 THz/nm$^2$. This level of position-squared coupling is approximately five orders of magnitude larger than in conventional Fabry-Perot cavity systems. Comment: 11 pages, 6 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|