Steve Griggs, Judy Zhu, Winston Chan, David Chodelka, Peter Zalud, Tom Senko, David Hill, Wei Zhang, Lewis Haber, Zane Shellenbarger, Xiaohui Wang, Chris Parks, James Kim, Jim Andrews, Rob Farkas, Jesse Battaglia, John Tower, Namwoong Paik
Many Lidar system applications are best implemented with photon-counting sensors such as Geiger-mode avalanche photo diode arrays (GmAPD). To meet this emerging need, SRI has become a merchant supplier for custom GmAPD sensor arrays. SRI is currently building several different custom sensor chip assembly (SCA) designs for our customers. These entirely new sensors are based on our extensive GmAPD design and camera sensor manufacturing experience and designed to address lessons learned in the field. Our objective is to build GmAPD arrays that are truly ready for use in fielded mission critical systems. We report on our development of new ROICS and both planar and mesa type detectors at 1.0um and 1.5um and our packaging, assembly, and testing approach for these new single photon sensitive sensors.
All-optical operation holds promise as the future of computing technology, and key components will include miniaturized waveguides (WGs) and optical switches that control narrow bandwidths. Nanowires (NWs) offer an ideal platform for nanoscale WGs, but their utility has been limited by the lack of comprehensive coupling scheme and of band selectivity. Here, we introduce a NW geometric superlattice (GSL) that allows controlled, narrow-band guiding in Si NWs through direct coupling of a Mie resonance with a bound guided state (BGS). Periodic diameter modulation in a GSL creates a Mie-BGS coupled-excitation that manifests as a scattering dark state with a pronounced scattering dip in the Mie resonance envelope. The frequency of the coupled mode, tunable from the visible to near-infrared, is determined by the pitch of the GSL and exhibits a Fourier-transform limited bandwidth. Using a combined GSL-WG system, we demonstrate spectrally-selective guiding and optical switching at telecommunication wavelengths, highlighting the potential to use NW GSLs for the design of on-chip optical components.
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