Feb 09

Power Insensitive Silicon Microring Resonators

Power Insensitive Silicon Microring Resonators

Lian-Wee Luo, Gustavo S. Wiederhecker, Kyle Preston, and Michal Lipson

http://dx.doi.org/10.1364/OL.37.000590

We demonstrate power insensitive silicon microring resonators without the need for active feedback control. The passive control of the resonance is achieved by utilizing the compensation of two counteracting processes, free carrier dispersion blueshift and thermo-optic redshift. In the fabricated devices, the resonant wavelength shifts less than one resonance linewidth for dropped power up to 335 μW, more than fivefold improvement in cavity energy handling capability compared to regular microrings.

 

 

Dec 16

Synchronization of Micromechanical Oscillators Using Light

Synchronization of Micromechanical Oscillators Using Light

Mian Zhang, Gustavo Wiederhecker, Sasikanth Manipatruni, Arthur Barnard, Paul McEuen, and Michal Lipson

arXiv:1112.3636

Synchronization, the emergence of spontaneous order in coupled systems, is of fundamental importance in both physical and biological systems. We demonstrate the synchronization of two dissimilar silicon nitride micromechanical oscillators, that are spaced apart by a few hundred nanometers and are coupled through optical radiation field. The tunability of the optical coupling between the oscillators enables one to externally control the dynamics and switch between coupled and individual oscillation states. These results pave a path towards reconfigurable massive synchronized oscillator networks.

Jan 31

Broadband Tuning of Optomechanical Cavities

Our paper “Broadband Tuning of Optomechanical Cavities” was published today in Optics Express, Vol. 19, Issue 3, pp. 2782-2790 (2011).

Jan 28

Research Positions Avaliable!

I am looking for highly motivated students to pursue research on the field of integrated photonics. The following topics are on my priority list:

  • Nonlinear optics in nanoscale optical waveguides and cavities.
  • Interaction of sound and light in optical microcavities, aka optomechanics.

Projects will be assigned based on the student level, i.e. scientific iniciation, master or doctorate degree. Experimental physics skills/talent are desired, although there is also room for theoretical and numerical computation work. Research will involve theoretical analyses, fabrication, and testing of micro and nano-scale optical devices such as optical waveguides and resonators.