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We demonstrate a parallel plate waveguide (PPWG) based terahertz spectroscopy approach to characterize the electromagnetic properties of two-dimensional (2D) materials. The amount of absorption exponentially increases with the waveguide length, therefore, the minimum detectable conductivity of this method sensitively increases by simply increasing the length of the waveguide along which the THz wave...
913 nm tapered diode lasers with 23th order laterally coupled grating is fabricated. Power of over 560 mW/facet and lateral divergence angle of 2.1° are achieved. Measured side mode suppression ratio is about 27 dB.
A bonding technique, capable of sub-micron and finer alignment accuracy, has been developed for electronics-optics heterogeneous integration applications. The technique is based on the principle of misalignment self-correction using bump (convex) and hollow (concave) elements, to align one die (i.e. a chip) to another one (i.e. a substrate) during the stacking process. Conductive hollow pad and Au...
We demonstrate 37% single-photon detection efficiency at 1550 nm via sum-frequency generation in a periodically poled lithium niobate waveguide, by pumping with a monolithic optical parametric oscillator tunable near 1800 nm.
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