Cavity-less on-chip optomechanics using excitonic transitions in semiconductor heterostructures

Area of Science:

• Optoelectronics
• Nanomechanics
• Condensed Matter Physics

Background:

• Optomechanical systems typically require optical cavities to couple light and mechanical motion.
• Semiconductor optoelectronics and nanomechanical resonators offer a highly integrable platform for novel device development.

Purpose of the Study:

• To develop a cavity-less optomechanical system for efficient light-mechanical coupling.
• To demonstrate high-sensitivity optomechanical spectroscopy and tunable control of nanomechanical resonators.

Main Methods:

• Hybridization of a semiconductor modulation-doped heterostructure with a cantilever.
• Utilizing excitons for opto-piezoelectric backaction to probe electronic transitions.
• Employing sub-nanowatt light power for optomechanical transduction.

Main Results:

• Achieved efficient cavity-less optomechanical transduction through excitons.
• Demonstrated high-sensitivity optomechanical spectroscopy by probing excitonic transitions.
• Observed self-feedback cooling and amplification of thermomechanical motion by detuning photon energy.
• Enabled tunable and addressable control of nanomechanical resonators.

Conclusions:

• The developed system offers a new paradigm for cavity-less optomechanics.
• This approach allows for high-speed, programmable manipulation of nanomechanical devices and sensor arrays.
• The findings pave the way for advanced integrated nanomechanical devices.