Balram, Krishna C. Davanco, Marcelo Lim, Ju Young Song, Jin Dong Srinivasan, Kartik 2024-01-20T08:03:39Z 2024-01-20T08:03:39Z 2021-09-04 2014-12-20 2334-2536 https://pubs.kist.re.kr/handle/201004/125983 Chip-based cavity optomechanical systems are being considered for applications in sensing, metrology, and quantum information science. Critical to their development is an understanding of how the optical andmechanical modes interact, quantified by the coupling rate g(0). Here, we develop GaAs optomechanical resonators and investigate the moving dielectric boundary and photoelastic contributions to g(0). First, we consider coupling between the fundamental radial breathing mechanical mode and a 1550 nm band optical whispering gallery mode in microdisks. For decreasing disk radius from R = 5 to 1 mu m, simulations and measurements show that g(0) changes from being dominated by the moving boundary contribution to having an equal photoelastic contribution. Next, we design and demonstrate nanobeam optomechanical crystals, in which a 2.5 GHz mechanical breathing mode couples to a 1550 nm optical mode, predominantly through the photoelastic effect. We show a significant (30%) dependence of g(0) on the device's in-plane orientation, resulting from the difference in GaAs photoelastic coefficients along different crystalline axes, with fabricated devices exhibiting g(0)/2 pi as high as 1.1MHz, for orientation along the [110] axis. GaAs nanobeam optomechanical crystals are a promising system, which can combine the demonstrated large optomechanical coupling strength with additional functionality, such as piezoelectric actuation and incorporation of optical gain media. (C) 2014 Optical Society of America English OPTICAL SOC AMER CRYSTAL CAVITY WAVE-GUIDES Moving boundary and photoelastic coupling in GaAs optomechanical resonators Article 10.1364/OPTICA.1.000414 1 OPTICA, v.1, no.6, pp.414 - 420 OPTICA 1 6 414 420 scopus 000354864400010 2-s2.0-84920853349 Optics Optics Article CRYSTAL CAVITY WAVE-GUIDES Microcavity devices Nanophotonics and photonic crystals