Wavelength-independent anti-interference coating for the far-infrared

Infrared Hall Effect in High-TcSuperconductors: Evidence for Non-Fermi-Liquid Hall Scattering

“…The infrared conductivity of this film obtained from measurements of its reflectance and transmittance is in good agreement with published data on twinned single crystals [15]. Since interference (etalon) effects can have a strong influence on IR Hall measurements, the substrates were either coated with a NiCr broadband antireflection coating [16] or wedged 1 ± to remove multiply reflected beams.…”

A Terahertz Photomixing Spectrometer: Application to SO2Self Broadening

“…The horizontally and vertiage characteristics and the rms dark current noise is cally polarized laser beams are kept on distinct channels by the polarizing beam splitters and separate photodiode Ç0.13 pW/ Hz at 4.2 K. Ideally, the radiation-absorbing Bi coating has the proper surface resistivity, r 0 /(n s 0 1), detectors. This linear scan control increases the precision for interpolating between markers, and greatly aids the repro-to eliminate reflections from the rear surface (27). Here r 0 is the impedance of free space, 377 V per square, and ducibility of scans for baseline normalization and pressure dependence, as we will show.…”

Unambiguous observation of subband transitions from longitudinal valley and oblique valleys in IV–VI multiple quantum wells

“…The sample temperature was varied from 4.2 to 300 K. To suppress unwanted FabryPérot interference fringes superposed on the FTIR transmission spectra, the top surface of the MQW samples was coated with a NiCr anti-interference film. 13 The differential spectra are obtained by taking the difference between a transmission spectrum at one temperature and the spectrum at a slightly lower temperature. This takes advantage of the temperature dependence of the PbSe band gap, so that step edges associated with different transitions in the transmission spectra become peaks in the difference spectra.…”