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We report a half-octave-spanning Kerr frequency comb which has the record-low phase noise floor with −130 dBc/Hz at 1 MHz offset for 18 GHz carrier frequency, and long-term Allan deviation of 7×10−11/τ0.84 with active stabilization.
Polymer microring resonators have been exploited for high-sensitivity and wideband photoacoustic imaging. To demonstrate high-sensitivity ultrasound detection, highfrequency photoacoustic imaging of a 49-μm-diameter black bead at an imaging depth of 5 mm was imaged photoacoustically using a synthetic 2-D array with 249 elements and a low laser fluence of 0.35 mJ/cm2. A bandpass filter with a center...
High-frequency ultrasound detection using polymer microring optical resonators is demonstrated. An optical microring resonator consists of a ring waveguide closely coupled to a straight bus waveguide, serving as light input and output. Acoustic waves irradiating the polymer ring waveguide can induce strain to deform the waveguide dimensions and change the refractive index of the waveguide via the...
Optical methods for detection and generation of ultrasound have unique features attractive for high resolution imaging. Very small receiver elements in the order of 10 mum can be formed without compromising signal to noise ratio. Advances made during the recent years boosted the sensitivity of resonant optics devices for ultrasound detection. The detection limit of these devices outperforms that of...
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