Paper 13102-16
Paper 13102-16
The Vertical Integrated Spectrometer (VIS) focal plane: orders of magnitude improvement in mm-wave Line Intensity Mapping (LIM) with an inline waveguide-to-on-chip transition
18 June 2024 • 17:10 - 17:30 Japan Standard Time | Room G318/319, North - 3F
Abstract
Scalable, densely packed spectrometer arrays (integral field units, or IFUs) would enable intensity mapping sensitive enough for precision measurements of cosmology and astrophysics in a new redshift regime. This scalability requires a new architecture, with spectrometers oriented parallel with incident light.
The key technology required is an inline waveguide-to-coplanar-waveguide transition. We present a millimeter-wave IFU concept that includes this new transition with on-chip kinetic-inductance-based spectrometers. The transition was designed with efficient Bayesian optimization and made robust to manufacturing tolerance with a novel optimization algorithm. It has >95% coupling over an octave bandwidth for 95% of randomly sampled transitions within tolerance. The design approach is of general interest to many instrument design problems; a Python implementation of the algorithm alongside an extension that automates a widely-used mesh-based EM solver are made publicly available. We also present the status of our efforts to fabricate transition prototypes in the 85--170 GHz band.
The key technology required is an inline waveguide-to-coplanar-waveguide transition. We present a millimeter-wave IFU concept that includes this new transition with on-chip kinetic-inductance-based spectrometers. The transition was designed with efficient Bayesian optimization and made robust to manufacturing tolerance with a novel optimization algorithm. It has >95% coupling over an octave bandwidth for 95% of randomly sampled transitions within tolerance. The design approach is of general interest to many instrument design problems; a Python implementation of the algorithm alongside an extension that automates a widely-used mesh-based EM solver are made publicly available. We also present the status of our efforts to fabricate transition prototypes in the 85--170 GHz band.
Presenter
Austin R. Stover
The Univ. of Chicago (United States)
Austin Reilly Stover is a doctoral candidate in the Department of Physics at the University of Chicago. He holds a Bachelor of Science in Electrical Engineering from Washington University in St. Louis, where he worked on nonimaging optics for the gamma-ray telescope concept APT. He graduated in 2020 and is now designing and fabricating focal planes and components for a next-generation mm-wave line intensity mapping experiment.