Integrated Filterbank for DESHIMA: A Submillimeter Imaging Spectrograph Based on Superconducting Resonators

TL;DR

This paper proposes an integrated filterbank design using superconducting resonators for a compact, broadband submillimeter imaging spectrograph, demonstrating feasibility through electromagnetic simulations and a practical device concept.

Contribution

It introduces a novel integrated filterbank configuration for DESHIMA, combining superconducting resonators and MKIDs, with a practical design for a multi-pixel, broadband spectrograph.

Findings

Achieves coupling efficiency > 1/2 with negligible transmission losses

Designs a 9x920 pixel device covering multiple submillimeter windows

Fitting on a 4-inch wafer with dispersion f/df = 1000

Abstract

An integrated filterbank (IFB) in combination with microwave kinetic inductance detectors (MKIDs), both based on superconducting resonators, could be used to make broadband submillimeter imaging spectrographs that are compact and flexible. In order to investigate the possibility of adopting an IFB configuration for DESHIMA (Delft SRON High-redshift Mapper), we study the basic properties of a coplanar-waveguide-based IFB using electromagnetic simulation. We show that a coupling efficiency greater than 1/2 can be achieved if transmission losses are negligible. We arrive at a practical design for a 9 pixel x 920 color 3 dimensional imaging device that fits on a 4 inch wafer, which instantaneously covers multiple submillimeter telluric windows with a dispersion of f/df = 1000.