SSS Optical Technologies LLC

Huntsville, AL, United States

SSS Optical Technologies LLC

Huntsville, AL, United States
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Nesterov V.V.,New Mexico Highlands University | Sarkisov S.S.,SSS Optical Technologies LLC | Shulaev V.,University of North Texas | Nesterov V.N.,University of North Texas
Acta Crystallographica Section E: Structure Reports Online | Year: 2011

In the title mol-ecule, C20H17Cl2NO, the central heterocyclic ring adopts a flattened boat conformation. The dihedral angles between the planar part of this central heterocyclic ring [maximum deviation = 0.004 (1) Å] and the two almost planar side-chain fragments [maximum deviations = 0.015 (1) and 0.019 (1) Å], that include the aromatic ring and bridging atoms, are 18.1 (1) and 18.0 (1)°. In the crystal, pairs of weak intermolecular C - H⋯O hydrogen bonds link molecules into inversion dimers that form stacks along the a axis. The structure is further stabilized by weak intermolecular C - H⋯π interactions involving the benzene rings.


Patel D.N.,Oakwood University | Jumper M.,Oakwood University | Wright III D.M.,Oakwood University | Sarkisov S.,SSS Optical Technologies LLC
Technical Proceedings of the 2013 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2013 | Year: 2013

Nano-colloids and nano-crystals doped with ions of rare-earth elements have recently attracted a lot of attention in the scientific community. This attention is due to unique physical, chemical and optical properties particularly attributed to nanometer size of the particles. They have great potential of being used in applications spanning from new types of lasers, especially blue and UV ones, phosphorous display monitors, optical communications, and fluorescence imaging. In this paper we investigate the infrared-to-visible upconversion luminescence in crystalline powder and nano-colloids. The photonic crystal fiber was filled with nano-colloids. The phosphors were prepared by using simple co-precipitation synthetic method. The initially prepared phosphors had very weak or no fluorescence signals. The fluorescence significantly increased after the phosphors were annealed at a temperature of 600°C. Nano-colloids of the phosphors were prepared in methanol as a solvent and later were utilized as laser filling medium in photonic crystal fibers. Under 980 nm laser excitation, ytterbium and erbium co-doped NaYF4 phosphor showed very strong upconversion signals at 408 nm, 539 nm and 655 nm, the ytterbium and holmium co-doped NaYp4 phosphor showed strong upconversion at 540 nm, 646 nm and 751 nm and the ytterbium and thulium co-doped NaYF4 phosphor showed strong upconversion at 376 nm, 476 nm, 647 nm, 689 nm and 802 nm. The reported nano-colloids are good candidates for fluorescent biosensing applications and also as a new laser filling medium in fiber lasers.


Patel D.N.,Oakwood University | Lewis A.,Oakwood University | Wright D.M.,Oakwood University | Lewis D.,Oakwood University | And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

In this paper we investigate optical properties and size distribution of the nano-colloids made of trivalent rare-earth ion doped fluorides: holmium and ytterbium, thulium and ytterbium, and erbium and ytterbium co-doped NaYF4. These materials were synthesized by using simple co-precipitation synthetic method. The initially prepared micro-crystals had very weak or no visible upconversion fluorescence signals when being pumped with a 980-nm laser. The fluorescence intensity significantly increased after the crystals were annealed at a temperature of 400°C-600°C undergoing the transition from cubic alpha to hexagonal beta phase of the fluoride host. Nano-colloids of the crystals were made in polar solvents using the laser ablation and ball milling methods. Size analyses of the prepared nano-colloids were conducted using a dynamic light scatterometer and atomic force microscope. The nano-colloids were filled in holey PCFs and their fluorescent properties were studied and the feasibility of new a type of fiber amplifier/laser was evaluated. © 2015 SPIE.


Patel D.,Oakwood University | Lewis A.,Oakwood University | Wright D.,Oakwood University | Velentine M.,Oakwood University | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Nano-colloids and nano-crystals doped with ions of rare-earth elements have recently attracted a lot of attention in the scientific community. This attention is due to unique physical, chemical and optical properties attributed to nanometer size of the particles. They have great potential of being used in applications spanning from new types of lasers, especially blue and UV ones, phosphorous display monitors, optical communications, and fluorescence imaging. In this paper we investigate the near-infrared upconversion luminescence in bulk crystals and nanocolloid filled photonic crystal fiber with ytterbium and holmium co-doped NaYF4 phosphor. The phosphor is prepared by using simple co-precipitation synthetic method. The initially prepared phosphor has very week upconversion fluorescence. The fluorescence significantly increased after the phosphor was annealed at a temperature of 600 °C. Nanocolloids of this phosphor were obtained using 1-propanol as solvent and they were utilized as laser filling medium in photonic crystal fibers. Under 980 nm diode laser excitation very strong upconversion signals were obtained for ytterbium and holmium co-doped phosphor at 541 nm, 646 nm and 751 nm. Pump power emissions, laser ablation and size analysis of the particles was conducted to understand the upconversion mechanisms. The particle sizes of the nanocolloids were analyzed using Atomic Force Microscope and Malvern Zetasizer instrument. The reported nanocolloids are good candidates for fluorescent biosensing applications and also as a new laser filling medium in fiber laser.


Patel D.,Oakwood University | Vance C.,Oakwood University | King N.,Oakwood University | Jessup M.,Oakwood University | And 2 more authors.
Journal of Nonlinear Optical Physics and Materials | Year: 2010

NaYF4:Er3+, Yb3+ crystals were prepared by simple synthetic method. Under 980 nm laser excitation, 408 nm, 539 nm and 655 nm upconversion emissions were recorded. Laser power and signal intensities of the upconverted emissions were obtained to understand the upconversion mechanisms. © 2010 World Scientific Publishing Company.


Patel D.N.,Oakwood University | Hardy L.A.,Oakwood University | Smith T.J.,Oakwood University | Smith E.S.,Oakwood University | And 2 more authors.
Journal of Luminescence | Year: 2013

We report on the infrared-to-visible upconversion luminescence in microcrystalline powders and photonic crystal fibers filled with nanocolloids of trivalent rare-earth ion co-doped NaYF 4 phosphor. The phosphor was prepared using a simple co-precipitation synthetic method. Nanocolloids of the phosphor were prepared by selective precipitation in methanol and laser ablation in water. Optical dynamic scatterometry determined average particle sizes of the nanocolloids of 1.5-1.9 nm in methanol and 83.8-86.4 nm in water. Nanocolloids of these phosphors were utilized as laser filling medium in photonic crystal fibers. © 2011 Elsevier B.V.


Sarkisov S.S.,SSS Optical Technologies LLC | Czarick M.,University of Georgia | Fairchild B.D.,University of Georgia | Liang Y.,University of Arkansas | And 2 more authors.
Optical Engineering | Year: 2014

The proposed colorimetric sensor of ammonia for the confined animal feeding industry uses the method of optoelectronic spectroscopic measurement of the reversible change of the color of a nanocomposite reagent film in response to ammonia.The film is made of a gold nanocolloid in a polymer matrix with an ammonia-Sensitive indicator dye additive.The response of the indicator dye (increase of the optical absorption between 550 and 650 nm) is enhanced by the nanoparticles (~8 nm in size) in two ways:(a) concentration of the optical field near the nanoparticle due to the plasmon resonance and (b) catalytic acceleration of the chemical reaction of deprotonization of the indicator dye in the presence of ammonia and water vapor. This enhancement helps to miniaturize the sensing element without compromising its sensitivity of <1 parts per million (ppm) for the range 0 to 100 ppm. The sensor underwent field tests in commercial poultry farms in Georgia and Arkansas and was compared against a scientific-grade photoacoustic gas analyzer. The coefficient of correlation between the sensor and the photoacoustic data for several weeks of continuous side-by-side operation in a commercial poultry house was ~0.9 and the linear regression slope was 1.0. The conclusions on the necessary improvements were made. © 2014 Society of Photo-Optical Instrumentation Engineers.


Sarkisov S.S.,SSS Optical Technologies LLC | Kukhtareva T.,University of Alabama | Kukhtarev N.V.,University of Alabama | Curley M.J.,University of Alabama | And 2 more authors.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2013

There is a great need for rapid detection of bio-hazardous species particularly in applications to food safety and biodefense. It has been recently demonstrated that the colonies of various bio-species could be rapidly detected using culture-specific and reproducible patterns generated by scattered non-coherent light. However, the method heavily relies on a digital pattern recognition algorithm, which is rather complex, requires substantial computational power and is prone to ambiguities due to shift, scale, or orientation mismatch between the analyzed pattern and the reference from the library. The improvement could be made, if, in addition to the intensity of the scattered optical wave, its phase would be also simultaneously recorded and used for the digital holographic pattern recognition. In this feasibility study the research team recorded digital Gabor-type (in-line) holograms of colonies of micro-organisms, such as Salmonella with a laser diode as a low-coherence light source and a lensless high-resolution (2.0x2.0 micron pixel pitch) digital image sensor. The colonies were grown in conventional Petri dishes using standard methods. The digitally recorded holograms were used for computational reconstruction of the amplitude and phase information of the optical wave diffracted on the colonies. Besides, the pattern recognition of the colony fragments using the cross-correlation between the digital hologram was also implemented. The colonies of mold fungi Altenaria sp, Rhizophus, sp, and Aspergillus sp have been also generating nano-colloidal silver during their growth in specially prepared matrices. The silver-specific plasmonic optical extinction peak at 410-nm was also used for rapid detection and growth monitoring of the fungi colonies. © 2013 Copyright SPIE.


Sarkisov S.S.,SSS Optical Technologies LLC | Czarick III M.,University of Georgia | Fairchild B.D.,University of Georgia | Liang Y.,University of Arkansas | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Recent research findings led the team to conclude that a long lasting and inexpensive colorimetric sensor for monitoring ammonia emission from manure in confined animal feeding operations could eventually become feasible. The sensor uses robust method of opto-electronic spectroscopic measurement of the reversible change of the color of a sensitive nano-composite reagent film in response to ammonia. The film is made of a metal (gold, platinum, or palladium) nano-colloid in a polymer matrix with an ammonia-sensitive indicator dye additive. The response of the indicator dye (increase of the optical absorption in the region 550 to 650 nm) is enhanced by the nano-particles (∼10 nm in size) in two ways: (a) concentration of the optical field near the nano-particle due to the plasmon resonance; and (b) catalytic acceleration of the chemical reaction of deprotonization of the indicator dye in the presence of ammonia and water vapor. This enhancement helps to make a miniature and rugged sensing element without compromising its sensitivity of less than 1 ppm for the range 0 to 100 ppm. The sensor underwent field tests in commercial broiler farms in Georgia, Alabama, and Arkansas and was compared against a commercial photoacoustic gas analyzer. The sensor output correlated well with the data from the photoacoustic analyzer (correlation coefficient not less than 0.9 and the linear regression slope after calibration close to 1.0) for several weeks of continuous operation. The sources of errors were analyzed and the conclusions on the necessary improvements and the potential use of the proposed device were made. © 2013 Copyright SPIE.


Patent
SSS Optical Technologies LLC | Date: 2010-11-27

A chemical sensor based on an indicator dye wherein a light transmissive element containing the indicator dye is made of a hygroscopic polymer. The polymer may be, for example, a polyimide or PMMA or other polymer. In an alternative embodiment the light transmissive element is doped with metal nanocolloidal particles. One embodiment may include a reference photodiode and differential amplifier to compensate for the fluctuations of the intensity of the light source. The light source may be pulse modulated. The sensor may include calibration means comprising a reference sample of the chemical to be detected and a precision delivery means. A method of fabricating the polymer and metal nanocolloid is disclosed wherein the nanocolloid is produced by generating a pulsed laser plasma in a suspension of metal particles and an organic solvent and adding the resulting solvent colloid to a solution containing the polymer.

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