Synthetic infrared spectra

Sinclair, Michael B.; Butler, M. A.; Kravitz, Stanley H.; Zubrzycki, W.; Ricco, Antonio J.

doi:10.1364/ol.22.001036

Cited by 25 publications

(13 citation statements)

References 5 publications

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“…Micrograting is an optical element that produces a diffraction field with desired spectral intensity. In 1997, Sinclair et al 2,3 suggested that the micrograting may replace the reference cell in IR correlation spectroscopy. Since then, there have been several efforts to design micrograting patterns.…”

Section: Introductionmentioning

confidence: 99%

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy^#

Choi

Kim

et al. 2015

Bulletin Korean Chem Soc

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Microgratings that were designed and fabricated to generate IR absorption spectra of SF6 and NH3 on diffraction into a specific detection angle were tested by correlation spectroscopy. The micrograting diffraction provides a reference spectrum for a target molecule, and its cross‐correlation with the transmission spectrum of a gas cell is obtained by varying the diffraction angle. As our optical setup can measure the dispersive transmission spectrum and the correlation spectrum under the same conditions, the two kinds of spectra were compared directly in terms of signal‐to‐noise ratio (SNR). The SNR’s of the correlation spectra were a few times lower than those of the dispersed spectra; therefore, the correlation spectroscopy can hardly be placed above the dispersive spectroscopy with respect to the SNR. The merit of the correlation spectroscopy is that a rather small range of modulation wavelength is needed to identify the target. Therefore, the correlation spectroscopy would be more useful for such target molecules whose spectra consist of broad peaks spread throughout a wide wavelength range.

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Section: Introductionmentioning

confidence: 99%

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy^#

Choi

Kim

et al. 2015

Bulletin Korean Chem Soc

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“…One of its applications is the correlation spectroscopy, [1][2][3] in which a micrograting generates a target spectrum whose correlation with a sample spectrum can identify the target molecule in the sample mixture. Microgratings may take on a fixed pattern to be used for a specific target or a programmed variable pattern to generate multiple target spectra.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Microgratings and their IR Diffraction Spectra

Kim¹,

Choi²,

Kim

et al. 2014

Bulletin of the Korean Chemical Society

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Microgratings whose diffracted field at a fixed angle generate IR spectra of SF6 or NH3 were fabricated by MEMS techniques for the purpose of IR correlation spectroscopy. Each micrograting was composed of 1441 reflecting lines in the area of 19.2 × 19.2 mm 2 . The depth profile of the line elements was determined with a gradient searching method that was described in our previous publication (J. Mod. Opt. 2013, 60, 324-330), and was discretized into 16 levels between 0 and 6.90 μm. The diffraction field from a given depth profile was calculated with Fraunhofer equation. The fabricated microgratings showed errors in the depth and the width within acceptable ranges. As the result, the diffracted IR spectrum of each micrograting matched well with its target reference spectrum within spectral resolution of our optical setup.

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“…Because of small size, light weight, great versatility, and low cost, DOGs become the first choice for laser beam shaping and focusing, spectral synthesizing [1][2], laser coupling, correlation filtering, wavelength-division multiplexing, signal processing, optical disk readout, beam array generation, feedback, and so on. Flexible spectrum synthesis now plays an important role in optical communication system for all optical network (AON).…”

Section: Introductionmentioning

confidence: 99%

“…Most recently, the design of the DOGs is used to synthesize the infrared spectra of real compounds in one direction by several groups [2][3][4]. Leskova et.al.…”

Section: Introductionmentioning

confidence: 99%

Design of diffractive optical gratings for realizing spatial splitting and wavelength demultiplexing simultaneously

Sun

Liu

Wang

et al. 2006

Proceedings of SPIE

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Diffractive optical gratings (DOGs) are designed for implementing beam splitting and wavelength demultiplexing simultaneously by the use of conjugate gradient optimization algorithm. A plane wave with multi-wavelength is demultiplexed and spatial splitled into the predesigned wavelengths and directions by the designed diffractive optical gratings. The numerical results show that the designed multi-functional DOGs can successfully generate desired wavelength at predesigned directions. It indicates that the DOG can be flexibly designed for realizing desired optical function. It is believed that this design can provide a useful information for designing the wavelength division multiplexer and the arrayed waveguide grating in various optical system.

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Synthetic infrared spectra

Cited by 25 publications

References 5 publications

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy^#

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy^#

Fabrication of Microgratings and their IR Diffraction Spectra

Design of diffractive optical gratings for realizing spatial splitting and wavelength demultiplexing simultaneously

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Synthetic infrared spectra

Cited by 25 publications

References 5 publications

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy#

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy#

Fabrication of Microgratings and their IR Diffraction Spectra

Design of diffractive optical gratings for realizing spatial splitting and wavelength demultiplexing simultaneously

Contact Info

Product

Resources

About

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy^#

IR Correlation Spectroscopy using Microgratings to be Compared with Dispersive IR Spectroscopy^#