The interaction of ultrasound and light in biological tissues results in a small amount of the scattered light being shifted relative to the carrier frequency (typically 1 part in 108). We have developed an inherently efficient and low noise quantum memory based technique to selectively absorb these ultrasound tagged photons in a pair of atomic frequency combs, and recover them delayed in time as a photon echo. In this manner we have demonstrated record ultrasoundmodulated sideband-to-carrier discrimination (49dB). Further, we confirm that the technique is compatible with highly scattering samples, and present initial acoustic pulse tracking measurements. This strongly suggests the suitability of the technique for biological tissue imaging.
|Journal||Proceedings of SPIE - International Society for Optical Engineering|
|Publication status||Published - 3 Mar 2014|
|Event||Photons Plus Ultrasound: Imaging and Sensing 2014 - San Francisco, CA, United States|
Duration: 2 Feb 2014 → 5 Feb 2014
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- Acousto-optic imaging
- Atomic frequency comb
- Cryogenic rare-earth ions
- Optical detection of ultrasound
- Quantum memory
- Ultrasound-modulated optical tomography