title: All optical reconfiguration of optomechanical filters.
abstract: Reconfigurable optical filters are of great importance for applications in optical                 communication and information processing. Of particular interest are tuning                 techniques that take advantage of mechanical deformation of the devices, as they                 offer wider tuning range. Here we demonstrate reconfiguration of coupled photonic                 crystal nanobeam cavities by using optical gradient force induced mechanical                 actuation. Propagating waveguide modes that exist over a wide wavelength range are                 used to actuate the structures and control the resonance of localized cavity modes.                 Using this all-optical approach, more than 18 linewidths of tuning range is                 demonstrated. Using an on-chip temperature self-referencing method, we determine                 that 20% of the total tuning was due to optomechanical reconfiguration and the rest                 due to thermo-optic effects. By operating the device at frequencies higher than the                 thermal cutoff, we show high-speed operation dominated by just optomechanical                 effects. Independent control of mechanical and optical resonances of our structures                 is also demonstrated.
authors.affiliation: School of Engineering and Applied Sciences, Harvard                     University, Cambridge, Massachusetts                 02138, USA.
authors.forename: Parag B
authors.initials: PB
authors.lastname: Deotare
authors.forename: Irfan
authors.initials: I
authors.lastname: Bulu
authors.forename: Ian W
authors.initials: IW
authors.lastname: Frank
authors.forename: Qimin
authors.initials: Q
authors.lastname: Quan
authors.forename: Yinan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Rob
authors.initials: R
authors.lastname: Ilic
authors.forename: Marko
authors.initials: M
authors.lastname: Loncar