Characterization of Diffusion Bonds Using an Acoustic Microscope

Solid state bonding is now being used in aircraft fabrication. As a result of this, various groups have considered the destructive examination of such bonds and categorized them in terms of characteristics seen in the examination of micrographic sections [1,2]. A range of studies which employ ultrasonic non-destructive techniques for bond-line characterization have also been undertaken [1,3,4]

ENHANCED NUCLEAR ACOUSTIC RESONANCE IN HoVO4.

We report the first experiments at GHz frequencies on 'enhanced nuclear acoustic resonance'. Enhanced nuclear resonance of 165Ho has been observed using longitudinal acoustic waves propagated along the (100) axis of a single crystal of HoVO4, at frequencies of 0. 7 to 1. 6 GHz

Electro-Optical Sampling of Single-Cycle THz Fields with Single-Photon Detectors

Electro-optical sampling of Terahertz fields with ultrashort pulsed probes is a well-established approach for directly measuring the electric field of THz radiation. This technique usually relies on balanced detection to record the optical phase shift brought by THz-induced birefringence. The sensitivity of electro-optical sampling is, therefore, limited by the shot noise of the probe pulse, and improvements could be achieved using quantum metrology approaches using, e.g., NOON states for Heisenberg-limited phase estimation. We report on our experiments on THz electro-optical sampling using single-photon detectors and a weak squeezed vacuum field as the optical probe. Our approach achieves field sensitivity limited by the probe state statistical properties using phase-locked single-photon detectors and paves the way for further studies targeting quantum-enhanced THz sensing