Recent developments in instrumentation in ellipsometry

Hauge, P.S.

doi:10.1016/0039-6028(80)90297-6

Cited by 227 publications

(42 citation statements)

References 80 publications

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“…Alternatively, the halogen flat-field lamp, linear polariser and half-wave plate which already exist within the AO188 adaptive optics system may be used to inject the linearly polarised reference, which has the advantage of characterising the optics within AO188 itself as well. By using the Wollaston prism as the analyser, a rotating-polariser / rotatingcompensator+fixed-analyser (RP/RCFA) type Mueller matrix polarimeter (Hauge 1980) is created. Data from such a setup can specify the first three columns of the Mueller matrix of the instrument.…”

Section: Appendix A: Calibration Of Instrumental Polarisationmentioning

confidence: 99%

The VAMPIRES instrument: imaging the innermost regions of protoplanetary discs with polarimetric interferometry

Norris¹,

Schworer²,

Tuthill³

et al. 2015

Monthly Notices of the Royal Astronomical Society

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Direct imaging of protoplanetary disks promises to provide key insight into the complex sequence of processes by which planets are formed. However imaging the innermost region of such disks (a zone critical to planet formation) is challenging for traditional observational techniques (such as near-IR imaging and coronagraphy) due to the relatively long wavelengths involved and the area occulted by the coronagraphic mask. Here we introduce a new instrument -VAMPIRES -which combines nonredundant aperture-masking interferometry with differential polarimetry to directly image this previously inaccessible innermost region. By using the polarisation of light scattered by dust in the disk to provide precise differential calibration of interferometric visibilities and closure phases, VAMPIRES allows direct imaging at and beyond the telescope diffraction limit. Integrated into the SCExAO system at the Subaru telescope, VAMPIRES operates at visible wavelengths (where polarisation is high) while allowing simultaneous infrared observations conducted by HICIAO. Here we describe the instrumental design and unique observing technique and present the results of the first on-sky commissioning observations, validating the excellent visibility and closure phase precision which are then used to project expected science performance metrics.

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Section: Appendix A: Calibration Of Instrumental Polarisationmentioning

confidence: 99%

The VAMPIRES instrument: imaging the innermost regions of protoplanetary discs with polarimetric interferometry

Norris¹,

Schworer²,

Tuthill³

et al. 2015

Monthly Notices of the Royal Astronomical Society

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“…Numerous instruments (optical polarimeters) have been devised [1][2][3] for measuring some or all of the components of S.…”

mentioning

confidence: 99%

Optimal beam splitters for the division-of-amplitude photopolarimeter

Azzam

2003

J. Opt. Soc. Am. A

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“…The following two equations calculate the gradient magnitude and azimuth distribution of optical paths in the specimen: (5) Notice that the algorithm considered above employs ratios between intensities of light that has interacted with the specimen. Therefore it suppresses contributions of absorption by the specimen, nonuniformity of illumination, etc., which can otherwise deteriorate a DIC image.…”

Section: Algorithm For Orientation-independent Dic Imagingmentioning

confidence: 99%

Orientation-independent differential interference contrast microscopy and its combination with an orientation-independent polarization system

Shribak

LaFountain

Biggs³

et al. 2008

J. Biomed. Opt.

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The article describes combined orientation-independent (OI-) DIC and polarization microscope and its biological applications. Several conventional DIC images were recorded with the specimen oriented in different directions followed by digital alignment and processing of the images. Then the obtained images are used for computation of the phase gradient magnitude and azimuth distribution, and, further, the phase image. The OI-DIC images were obtained using optics having numerical aperture 1.4, thus achieving a level of resolution never before achieved with any phase contrast or interference microscope. The combined system yields two complementary phase images of thin optical sections of the specimen: distribution of refractive index and distribution of birefringence due to anisotropy of the cell structure. For instance, in a live dividing cell, the OI-DIC image clearly shows the detailed shape of the chromosomes while the polarization image quantitatively depicts the distribution of birefringent microtubules in the spindle, both without any need for staining or other modifications of the cell. We present pseudo-color combined images of a crane-fly spermatocyte at diakinesis and metaphase of meiosis I. Those images provide clear evidence that the proposed technique can reveal fine architecture and molecular organization in live cells without perturbation associated with staining or fluorescent labeling.

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Recent developments in instrumentation in ellipsometry

Cited by 227 publications

References 80 publications

The VAMPIRES instrument: imaging the innermost regions of protoplanetary discs with polarimetric interferometry

The VAMPIRES instrument: imaging the innermost regions of protoplanetary discs with polarimetric interferometry

Optimal beam splitters for the division-of-amplitude photopolarimeter

Orientation-independent differential interference contrast microscopy and its combination with an orientation-independent polarization system

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