کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1784250 | 1524119 | 2014 | 5 صفحه PDF | دانلود رایگان |
• We describe the design of a silicon quarter retarder working in the far infrared.
• The device produces far-infrared light with a high degree of circular polarization.
• We demonstrate its performance by photo-induced magnetospectroscopy of GaAs.
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.
Journal: Infrared Physics & Technology - Volume 67, November 2014, Pages 436–440