Threshold effects in light scattering from a binary diffraction grating

Anderson, Brian B.; Brodsky, Anatol M.; Burgess, Lloyd W.

doi:10.1103/physreve.54.912

Cited by 27 publications

(33 citation statements)

References 9 publications

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“…For instance, threshold phenomena are especially sensitive to the refractive index of the medium next to the grating surface. 16 Any changes in the dielectric environment at the grating surface are capable of changing the properties of evanescent waves generated and, thus, the threshold characteristics. Indeed, sensing methods based on threshold phenomena have been reported for determination of bulk refractive indices 16 and size characterization of colloidal suspensions.…”

Section: Resultsmentioning

confidence: 99%

“…Since a threshold phenomenon such as this is sensitive to changes in the refractive index near the grating surface, 16 we chose to test the sensitivity of the measured peak position to the thickness of the alkanethiolate molecular films. The position of the threshold absorbance peak was measured for the DT, MUL, MUA, and BSA on MUA films.…”

Section: Resultsmentioning

confidence: 99%

“…14 Grating-based diffraction sensor strategies have generated renewed interest due to their surface-sensitive optical properties. Examples include twophoton fluorescence enhancement 15 and light reflection spectroscopy, 16 which have been used for the characterization of colloids, 17 and nanoparticles 18 as well as the determination of bulk refractive indices. 16 The detection of volatile organic compounds by chemoselective polymeric gratings has recently been demonstrated 19 as well as "tunable" diffraction gratings constructed from electroactive materials.…”

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confidence: 99%

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Grating-Coupler Assisted Infrared Reflection Absorption Spectroscopy for the Characterization of Organic Thin Films

Singh

Hillier

2006

Anal. Chem.

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We demonstrate how grating-coupler assisted infrared reflection absorption spectroscopy can be used to simultaneously determine the chemical identity and relative thickness of organic thin films. With a grating substrate, a threshold anomaly associated with passing off of the -1 diffracted order occurs at grazing angles of incidence, resulting in a sharp absorbance in the infrared. The position of this peak is sensitive to the grating geometry as well as the dielectric environment near its surface. Thus, shifts in the peak position can be used to determine the relative thickness of adsorbed films or quantify molecular adsorption events. To illustrate the characteristics and sensitivity of this phenomenon, several samples were prepared and tested, including self-assembled alkanethiolate monolayers with 11-mercaptoundecanoic acid, 11mercapto-1-undecanol, decanethiol, and a covalently linked layer of bovine serum albumin on a commercial, goldcoated grating. For these samples, the position of the threshold absorbance peak shifted to lower wavenumbers as film thickness increased, which is consistent with calculated shifts based upon an increasing refractive index at the interface. The sensitivity of this shift was measured to be 3.7 cm -1 nm -1 . These results illustrate how a grating substrate can be exploited in a standard infrared reflectance measurement to provide additional information about the relative thickness of adsorbed surface films.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Grating-Coupler Assisted Infrared Reflection Absorption Spectroscopy for the Characterization of Organic Thin Films

Singh

Hillier

2006

Anal. Chem.

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“…The threshold singularity may be rewritten to include the experimentally relevant quantities listed above as follows [15]:…”

Section: Theorymentioning

confidence: 99%

“…These changes manifest themselves by the appearance of a specific imaginary component in the effective dielectric constant. The rich information contained in the reflection spectrum near the threshold allows for separation of surface and bulk effects in the sample and for simultaneous determination of the real part and imaginary (absorptive) parts of the dielectric function of a sample [15,16].…”

Section: Introductionmentioning

confidence: 99%

Periodic structures modified with silver nanoparticles for novel plasmonic application

Šileikaitčė

Tamulevičius

et al. 2008

SPIE Proceedings

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Forming structures similar to or smaller than the optical wavelength offers a wide range of possibilities to modify the optical properties of materials. Tunable optical nanostructures can be applied as materials for surface-enhanced spectroscopy, optical filters, plasmonic devices, and sensors. In this work we present experimental results on technology and properties of periodical, polymer based optical structures modified by ordered adsorption of silver nanoparticles. These structures were formed combining UV hardening and dip coating from colloidal solutions. We have investigated the influence of silver nanoparticles assembly on the ambient conditions (deposition temperature and time) and surface features (periodicities and shape) of the template micro structures. Optical absorbance as well as morphology of the structures containing silver nanoparticles were investigated by UV-VIS spectroscopy, AFM, SEM and optical microscopy. The influence of silver nanoparticles on the optical properties of the structures was investigated by polarized light spectroscopy (Grating Light Reflection Spectroscopy -GLRS). From the results of this study we propose a low cost procedure for fabricating structures that could be potentially new type of plasmonic sensors exploiting surface enhanced plasmon resonance in silver nano structures.

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Comparative analysis of different properties of polyhydroxyalkanoates isolated from two different bacterial strains: Alkaliphilus oremlandii OhILAs and recombinant Escherichia coli XL1B

Pramanik

Mukherjee

Nandy

et al. 2014

J of Applied Polymer Sci

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We synthesized poly(3‐hydroxybutyrate‐co‐3‐hydroxyvalerate) [P(3‐HB‐co‐3‐HV)] copolymer having different contents of 3‐hydroxyvalerate (3‐HV) units (16.04, 16.3, 24.95, 25.62, and 16.52 mol % 3‐HV) with different yields of polyhydroxyalkanoates (PHAs) by feeding with different cooking oils and with Alkaliphilus oremlandii OhILAs strain. The PHA production efficiency of the Alkaiphilus strain was compared with that of the control strain, Bacillus cereus. The synthesis of each PHA biopolymer was performed with different toxic spent oils as the sole carbon source in an oil‐in‐water‐based microemulsion medium. We observed that the productivity of the poly(3‐hydroxybutyrate) [P(3‐HB)] copolymer from the Alkaliphilus strain was higher than those of the PHAs isolated from B. cereus and the Escherichia coli XL1B strain. The synthesized PHA copolymers were characterized by 1H‐NMR and Fourier transform infrared (FTIR) spectroscopy. In the 1H‐NMR spectra, a doublet resonance peak at 1.253 ppm of the/ methyl protons of the 3‐hydroxybutyrate (3‐HB) side group and one at 0.894 ppm due to the methyl protons of the 3‐HV side group indicated the presence of 3‐HB and 3‐HV units in the copolymer. The chemical shift values at 1.25 and 2.2 ppm, due to the resonance absorption peaks of the methyl protons and methylene protons, confirmed the synthesis of the P(3‐HB) homopolymer. From the FTIR spectra, a strong CO stretching frequency in the range of 1745–1727 cm−1, together with strong CO stretching bands near 1200 cm−1 and a strong band near 3400 cm−1, confirmed the synthesis of P(3‐HB‐co‐3‐HV) and P(3‐HB). Thus, waste cooking oil as a substrate provided an alternate route for the formation of P(3‐HB‐co‐3‐HV) and P(3‐HB) by Alkaliphilus and E. coli strains, respectively. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41080.

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Threshold effects in light scattering from a binary diffraction grating

Cited by 27 publications

References 9 publications

Grating-Coupler Assisted Infrared Reflection Absorption Spectroscopy for the Characterization of Organic Thin Films

Grating-Coupler Assisted Infrared Reflection Absorption Spectroscopy for the Characterization of Organic Thin Films

Periodic structures modified with silver nanoparticles for novel plasmonic application

Comparative analysis of different properties of polyhydroxyalkanoates isolated from two different bacterial strains: Alkaliphilus oremlandii OhILAs and recombinant Escherichia coli XL1B

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