Broadband polarization rotator for the infrared

Johnston, L. H.

doi:10.1364/ao.16.001082

Cited by 21 publications

(5 citation statements)

References 2 publications

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“…Polarization of the visible beam is controlled by a zero-order half-wave plate, while the IR beam polarization can be changed using the three-mirror polarization rotator before the sample. We use an analyzer after the sample to select the polarization of the SFG signal.…”

Section: Methodsmentioning

confidence: 99%

Molecular Order in Langmuir−Blodgett Monolayers of Metal−Ligand Surfactants Probed by Sum Frequency Generation

Jayathilake¹,

Driscoll²,

Bordenyuk³

et al. 2009

Langmuir

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Molecular organization of Langmuir-Blodgett (LB) monolayers of novel copper-containing metal-ligand surfactants was characterized by the surface-selective vibrational sum frequency generation (SFG) spectroscopy. The orientational and conformational order inferred from the SFG peak amplitudes and line shapes were correlated with the two-dimensional phases of the monolayers observed in the compression isotherms. The octadecyl-pyridin-2-ylmethyl-amine (L(PyC18)) ligand by itself shows good amphiphilic properties, as indicated by the high monolayer collapse pressure at the air/water interface, but its LB films transferred onto fused silica exhibit a high degree of trans-gauche conformational disorder in the alkyl tails. Coordination of copper(II) ions to the chelating head group enhances the molecular alignment and reduces the fraction of gauche defects of the alkyl chains. Monolayers of single-tail (L(PyC18)Cu(II)Cl(2)) and double-tail [(L(PyC18))(2)Cu(II)]Cl(2) metallosurfactants show distinctly different behavior of their molecular organization as a function of the area per molecule. Our observations suggest metal-ligand interactions as a pathway to induce molecular order in LB monolayer films.

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Section: Methodsmentioning

confidence: 99%

Molecular Order in Langmuir−Blodgett Monolayers of Metal−Ligand Surfactants Probed by Sum Frequency Generation

Jayathilake¹,

Driscoll²,

Bordenyuk³

et al. 2009

Langmuir

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“…For a single reflection from a silver mirror at 45°incident angle, this value is estimated to be 2.6°and 26°at 5 m and 500 nm, respectively. 21 Furthermore, commercially available metallic mirrors often come with dielectric or oxide coatings over the metal surfaces for protective and reflection-enhancing purposes. Such coatings contribute to the phase-shift difference between S and P polarization.…”

Section: ͑2͒mentioning

confidence: 99%

Polarization selective spectroscopy experiments: methodology and pitfalls

2005

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We analyze the effectiveness of various practical implementations of time-dependent pump-probe and transient grating polarization-selective experiments. A variety of optical arrangements are analyzed in the Jones matrix calculus framework. The optical arrangements that permit the correct determination of the timedependent orientational and excited-state population dynamics are delineated. It is shown that magic angle transient grating experiments yield pure population dynamics under certain conditions only. The effectiveness of spectrally resolved magic angle pump-probe and transient grating experiments that use a monochromator are shown to be dependent on the position of an analyzing polarizer along the experimental beam path relative to various other optical elements. The spectrally resolved experiments will measure pure population dynamics only if a polarizer is placed immediately after the sample. The effectiveness of experiments measuring orientational dynamics by separately measuring the probe signal with its polarization parallel and perpendicular to the pump polarization is not constrained by the conditions imposed on the magic angle experiments.

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“…A K‐mirror polarization rotator sits at the entrance of the 643 GHz receiver [ Johnson , 1977]. Rotating the K‐mirror 45 degrees rotates the polarization of the incoming radiation by 90 degrees.…”

Section: Submillimeter‐wave Cloud Ice Radiometermentioning

confidence: 99%

Submillimeter‐Wave Cloud Ice Radiometer: Simulations of retrieval algorithm performance

Walter²,

et al. 2002

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[1] The Submillimeter-Wave Cloud Ice Radiometer (SWCIR), developed by the Jet Propulsion Laboratory to fly on the NASA DC-8, has ten channels from four receivers at 183, 325, 448, and 643 GHz. The SWCIR is designed to retrieve upper tropospheric cloud ice water path (IWP) and median mass equivalent sphere diameter (D me ). This paper describes the retrieval algorithm developed for the SWCIR, results from retrieval simulations, and the rationale for choosing the SWCIR frequencies. The retrieval algorithm uses Bayes theorem to combine prior information about atmospheric properties with radiative transfer simulations. The algorithm uses a precalculated database of stochastic cirrus/atmospheric profiles and corresponding simulated SWCIR brightness temperatures. Statistics of cirrus microphysics are derived from in situ cloud probe data obtained during midlatitude winter and tropical field experiments, and include correlations between temperature, particle size, and ice water content. The Bayesian algorithm effectively interpolates between database cases that approximately match the observed SWCIR brightness temperatures. Retrieval experiments are performed for midlatitude winter ice clouds with the SWCIR viewing downward from 12 km and for tropical anvil cirrus with the SWCIR viewing upward from 10 km. Each experiment simulates SWCIR brightness temperatures (with 1 K added noise) from 10000 random cloud/atmosphere profiles. For clouds with IWP greater than 5 g/m 2 (which contain 97% of the simulated total ice mass) the overall median retrieval error is about 30% for IWP and 15% for D me . The effects of liquid clouds just below ice clouds and of nonspherical ice particle shapes are small.

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Broadband polarization rotator for the infrared

Cited by 21 publications

References 2 publications

Molecular Order in Langmuir−Blodgett Monolayers of Metal−Ligand Surfactants Probed by Sum Frequency Generation

Molecular Order in Langmuir−Blodgett Monolayers of Metal−Ligand Surfactants Probed by Sum Frequency Generation

Polarization selective spectroscopy experiments: methodology and pitfalls

Submillimeter‐Wave Cloud Ice Radiometer: Simulations of retrieval algorithm performance

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