A broadband silicon quarter-wave retarder for far-infrared spectroscopic circular dichroism

Xiaoxiang Xi, R. J. Smith, T. N. Stanislavchuk, A. A. Sirenko, S. N. Gilbert, J. J. Tu, G. L. Carr

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The high brightness, broad spectral coverage and pulsed characteristics of infrared synchrotron radiation enable time-resolved spectroscopy under throughput-limited optical systems, as can occur with the high-field magnet cryostat systems used to study electron dynamics and cyclotron resonance by far-infrared techniques. A natural extension for magnetospectroscopy is to sense circular dichroism, i.e. the difference in a material's optical response for left and right circularly polarized light. A key component for spectroscopic circular dichroism is an achromatic 14 wave retarder functioning over the spectral range of interest. We report here the development of an in-line retarder using total internal reflection in high-resistivity silicon. We demonstrate its performance by distinguishing electronic excitations of differing handedness for GaAs in a magnetic field. This 14 wave retarder is expected to be useful for far-infrared spectroscopy of circular dichroism in many materials.

Original languageEnglish (US)
Pages (from-to)436-440
Number of pages5
JournalInfrared Physics and Technology
Volume67
DOIs
StatePublished - Nov 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Keywords

  • 1 4 wave retarder
  • Circular dichroism
  • Circularly polarized light
  • Cyclotron resonance
  • Excitons
  • Far-infrared magnetospectroscopy

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