Investigation of planar switches for large format CMB polarization instruments

Paul K. Grimes, Ghassan Yassin, Leonid S. Kuzmin, Phillip D. Mauskopf, Ernst Otto, Michael E. Jones, Chris E. North

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Several technologies are now being considered for modulating the polarization in various B-mode instruments, including rotating quasioptical half-wave plates in front of the focal plane array, rotating waveguide half-wave plates and Faraday rotators. It is not at all clear that any of these techniques is feasible without heavy penalty in cost or performance. A potentially much more efficient method is to use a pseudo-correlation polarimeter in conjunction with a planar circuit phase switch. We investigate three different devices for use as mm-wave switches, SIS tunnel junctions, capacitively coupled super-conducting nanostrips and RF MEMS. The SIS tunnel junction switches operate by switching between two different bias voltages, while the nanostrip switch operates by changing the impedance of a resonant circuit by driving the nanostrip from the superconducting to normal state. In each case the RF signal sees two substantially different complex impedance states, hence could be switched from one transmission line branch to another. In MEMS this is achieved by mechanical movement of one plate of a parallel plate capacitor system. Although RF MEMS have been reported at high microwave and low mm-wave frequencies, in this work we have investigated cryogenic MEMS for operation at high mm-wave frequencies (225 GHz) using superconducting transmission lines. We present and compare designs and simulations of the performance of phase switches based on all three switching technologies, as well as preliminary experimental results for each of the switches. Finally we also present designs of phase shift circuits that translates the on/off switching into phase modulation.

Original languageEnglish (US)
Title of host publicationMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III
DOIs
StatePublished - 2006
EventMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III - Orlando, FL, United States
Duration: May 29 2006May 31 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6275
ISSN (Print)0277-786X

Other

OtherMillimeter and Submillimeter Detectors and Instrumentation for Astronomy III
CountryUnited States
CityOrlando, FL
Period5/29/065/31/06

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Grimes, P. K., Yassin, G., Kuzmin, L. S., Mauskopf, P. D., Otto, E., Jones, M. E., & North, C. E. (2006). Investigation of planar switches for large format CMB polarization instruments. In Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III [627525] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6275). https://doi.org/10.1117/12.671151