Anisotropic contrast optical microscope

Peev, Darin; Hofmann, Tino; Kananizadeh, Negin; Beeram, Sandya; Rodriguez, Elliott; Wimer, Shawn; Rodenhausen, Keith B.; Herzinger, C. M.; Kasputis, Tadas; Pfaunmiller, Erika L.; Nguyen, Anh Le-Trang; Korlacki, Rafał; Pannier, Angela K.; Li, Y.; Schubert, Eva; Hage, David S.; Schubert, Mathias

doi:10.1063/1.4965878

Cited by 10 publications

(3 citation statements)

References 103 publications

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“…Figure 7 depicts the change in the p-polarized transmission coefficients for different c NaCl values, from 1 ppm to 1000 ppm. The gray area indicates the region where a photon-counting based spectrophotometer typically will report noise, with a linear dynamic range over 6 orders of magnitude 57 . Under such assumptions, it can be seen that the existence of 1 ppm NaCl in pure water will be detectable.…”

Section: Discussionmentioning

confidence: 99%

Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films

Kılıç

Mock

Feder

et al. 2019

Sci Rep

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We report on fabrication of spatially-coherent columnar plasmonic nanostructure superlattice-type thin films with high porosity and strong optical anisotropy using glancing angle deposition. Subsequent and repeated depositions of silicon and gold lead to nanometer-dimension subcolumns with controlled lengths. We perform generalized spectroscopic ellipsometry measurements and finite element method computations to elucidate the strongly anisotropic optical properties of the highly-porous Si-Au slanted columnar heterostructures. The occurrence of a strongly localized plasmonic mode with displacement pattern reminiscent of a dark quadrupole mode is observed in the vicinity of the gold subcolumns. We demonstrate tuning of this quadrupole-like mode frequency within the near-infrared spectral range by varying the geometry of Si-Au slanted columnar heterostructures. In addition, coupled-plasmon-like and inter-band transition-like modes occur in the visible and ultra-violet spectral regions, respectively. We elucidate an example for the potential use of Si-Au slanted columnar heterostructures as a highly porous plasmonic sensor with optical read out sensitivity to few parts-per-million solvent levels in water.

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Section: Discussionmentioning

confidence: 99%

Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films

Kılıç

Mock

Feder

et al. 2019

Sci Rep

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“…This agrees very well with reported thicknesses and tilt angles of this particular SAM and ellipsometry data of such thin films. [52][53][54][55] FIG. 8.…”

Section: B Thickness Of Confined Molecular Layers Radius Calibration ...mentioning

confidence: 99%

Optimizing multiple beam interferometry in the surface forces apparatus: Novel optics, reflection mode modeling, metal layer thicknesses, birefringence, and rotation of anisotropic layers

Schwenzfeier

Erbe

Bilotto

et al. 2019

Review of Scientific Instruments

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Multiple beam interferometry (MBI) evolved as a powerful tool for the simultaneous evaluation of thin film thicknesses and refractive indices in Surface Forces Apparatus (SFA) measurements. However, analysis has relied on simplifications for providing fast or simplified analysis of recorded interference spectra. Here, we describe the implementation of new optics and a generalized fitting approach to 4 × 4 transfer matrix method simulations for the SFA. Layers are described by dispersive complex refractive indices, thicknesses, and Euler angles that can be fitted, providing modeling for birefringent or colored layers. Normalization of data by incident light intensities is essential for the implementation of a fitting approach. Therefore, a modular optical system is described that can be retrofit to any existing SFA setup. Real-time normalization of spectra by white light is realized, alignment procedures are considerably simplified, and direct switching between transmission and reflection modes is possible. A numerical approach is introduced for constructing transfer matrices for birefringent materials. Full fitting of data to the simulation is implemented for arbitrary multilayered stacks used in SFA. This enables self-consistent fitting of mirror thicknesses, birefringence, and relative rotation of anisotropic layers (e.g., mica), evaluation of reflection and transmission mode spectra, and simultaneous fitting of thicknesses and refractive indices of media confined between two surfaces. In addition, a fast full spectral fitting method is implemented for providing a possible real-time analysis with up to 30 fps. We measure and analyze refractive indices of confined cyclohexane, the thickness of lipid bilayers, the thickness of metal layers, the relative rotation of birefringent materials, contact widths, as well as simultaneous fitting of both reflection and transmission mode spectra of typical interferometers. Our analyses suggest a number of best practices for conducting SFA and open MBI in an SFA for increasingly complex systems, including metamaterials, multilayered anisotropic layers, and chiral layers.

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“…In a study by Kirchert et al. , UTLC plates made with GLAD and containing silicon dioxide nanostructured thin films were coupled with electrospray ionization mass spectrometry to separate and characterize sugars . UTLC plates have been prepared by Hall et al .…”

Section: Nanomaterials In Planar Liquid Chromatographymentioning

confidence: 99%

Nanomaterials as stationary phases and supports in liquid chromatography

et al. 2017

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The development of various nanomaterials over the last few decades has led to many applications for these materials in liquid chromatography (LC). This review will look at the types of nanomaterials that have been incorporated into LC systems and the applications that have been explored for such systems. A number of carbon-based nanomaterials and inorganic nanomaterials have been considered for use in LC, ranging from carbon nanotubes, fullerenes and nanodiamonds to metal nanoparticles and nanostructures based on silica, alumina, zirconia and titanium dioxide. Many ways have been described for incorporating these nanomaterials into LC systems. These methods have included covalent immobilization, adsorption, entrapment, and the synthesis or direct development of nanomaterials as part of a chromatographic support. Nanomaterials have been used in many types of LC. These applications have included the reversed-phase, normal-phase, ion-exchange, and affinity modes of LC, as well as related methods such as chiral separations, ion-pair chromatography and hydrophilic interaction liquid chromatography. Both small and large analytes (e.g., dyes, drugs, amino acids, peptides and proteins) have been used to evaluate possible applications for these nanomaterial-based methods. The use of nanomaterials in columns, capillaries and planar chromatography has been considered as part of these efforts. Potential advantages of nanomaterials in these applications have included their good chemical and physical stabilities, the variety of interactions many nanomaterials can have with analytes, and their unique retention properties in some separation formats.

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Anisotropic contrast optical microscope

Cited by 10 publications

References 103 publications

Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films

Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films

Optimizing multiple beam interferometry in the surface forces apparatus: Novel optics, reflection mode modeling, metal layer thicknesses, birefringence, and rotation of anisotropic layers

Nanomaterials as stationary phases and supports in liquid chromatography

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