Quantum-enhanced stimulated Brillouin scattering spectroscopy and imaging

Area of Science:

• Quantum optics
• Biophotonics
• Microscopy

Background:

• Brillouin microscopy is a label-free technique for assessing viscoelastic properties.
• Classical stimulated Brillouin scattering (SBS) can be limited by signal-to-noise ratio (SNR).
• Biological samples are susceptible to phototoxicity and thermal damage from high optical power.

Purpose of the Study:

• To demonstrate quantum-enhanced stimulated Brillouin scattering (SBS) using low-power lasers.
• To improve the SNR of Brillouin microscopy for biological imaging.
• To explore the potential for reduced phototoxicity in bio-imaging applications.

Main Methods:

• Utilized two-mode intensity-difference squeezed light generated via four-wave mixing in atomic rubidium vapor.
• Employed low-power continuous-wave lasers at 795 nm, within the water transparency window.
• Measured the signal-to-noise ratio (SNR) enhancement achieved with quantum light compared to classical methods.

Main Results:

• Achieved a 3.4 dB signal-to-noise ratio enhancement in stimulated Brillouin scattering.
• Demonstrated the use of low optical power, minimizing potential phototoxicity and thermal effects.
• Showcased the feasibility of quantum-enhanced SBS for imaging in the water transparency window.

Conclusions:

• Quantum-enhanced SBS offers a significant improvement in sensitivity for label-free mechanical property assessment.
• The technique holds promise for sensitive bio-imaging of delicate biological samples.
• The method is adaptable for both spectroscopic and imaging applications in biology, potentially surpassing classical limitations.