|2019 Spring Graduate Colloquium Series|
High Spectral Resolution Plasmonic Color Filters with Subwavelength Dimensions
Moores law has been fueling rapid advances in image sensor technology by having more of a focus on decreasing their size over the achievable filter spectral resolution. This drive has been useful for three-color imagining but has prevented the realization of chip-based image sensors with simultaneously high spatial and spectral resolution. This paper reports a concept that overcomes this trade-off, enabling high spectral resolution (transmission FWHM <31 nm) filters with subwavelength dimensions operating at optical and near-infrared wavelengths. An inverse design methodology was used to realize a new type of plasmonic cavity that efficiently couples an in-plane Fabry–Perot resonator to a single plasmonic slit that supports surface plasmon polaritons. This design principle, combined with a new metal imprinting method that yields metallic nanostructures with both top and bottom surfaces that are extremely smooth, enabled demonstration of high spectral resolution transmission filters with a smaller area than any previously reported.
Searching for supersymmetry
For the past two decades, thousands of physicists have searched extensively through large data sets of high energy proton-proton collisions for supersymmetric particles, i.e., the superpartners of the observed particles of the standard model. Supersymmetric theories provide an explanation to several physical phenomena currently unexplained by the standard model. The method discussed analyzes 35.9 fb-1 of 13 TeV pp collision data collected at the LHC by the CMS detector in 2016. No significant excess within the expectation of the standard model has been observed, though upper exclusion limits have been placed on gluino masses (1.86 TeV) and squark masses (1.59 TeV) at 95% confidence level.
 CMS Collaboration. Search for supersymmetry in final states with photons and missing transverse momentum in proton-proton collisions at 13 TeV, 17 Mar 2019, arxiv:1903.07070.
For more information contact: Dr. Kenneth Park 254-710-2282