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2D photonic-crystal optomechanical nanoresonator
Optics Letters
|February 14, 2015
Summary
Researchers optimized an optomechanical device using a near-wavelength grating (NWG) in an InP membrane. This design achieves high reflectivity and forms a microcavity for probing mechanical motion.
Area of Science:
- Optomechanics
- Nanophotonics
- Materials Science
Background:
- Optomechanical devices are crucial for sensing and quantum technologies.
- High-reflectivity optical elements are essential for creating efficient microcavities.
- Suspended membranes offer unique mechanical and optical properties.
Purpose of the Study:
- To optically optimize a novel optomechanical device.
- To achieve high reflectivity (>99.8%) over a 50-nm bandwidth using a near-wavelength grating (NWG).
- To integrate the NWG into a compact microcavity for mechanical mode probing.
Main Methods:
- Numerical simulations to identify optimal geometrical parameters for the NWG.
- Analysis of limitations due to finite optical waist and lateral size.
- Fabrication of a suspended Indium Phosphide (InP) membrane with a 2D NWG.
- Formation of a microcavity using the membrane as an end mirror.
Main Results:
- Achieved reflectivity >99.8% over a 50-nm spectral span.
- Designed a compact microcavity with a waist size <10 μm.
- Demonstrated a cavity finesse in the 200 range.
- Successfully used the device to probe Brownian motion of mechanical modes.
Conclusions:
- The optimized NWG in a suspended InP membrane enables high-performance microcavities.
- The device is suitable for sensitive probing of mechanical motion.
- This work advances the development of compact and efficient optomechanical sensors.
