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Journal Cover Photonics and Optoelectronics
   [4 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2304-1064 - ISSN (Online) 2304-1072
     Published by Science and Engineering Publishing Company Homepage  [46 journals]
  • The Relationship between the Structure and the Binding to Bovine Serum
           Albumin of Some Styrylcyanine Dyes

    • Abstract: The Relationship between the Structure and the Binding to Bovine Serum Albumin of Some Styrylcyanine Dyes
      Pages 15-25
      Author Gairat KhodjayevEldar N. KurtalievNegmat Nizomo
      Spectral-fluorescent characteristics of styrylcyanine dye Sbt ((E)-2-(4-(dimethylamino) styryl)-3-methylbenzo [d] thiazol-3-ium iodide) and its derivatives in aqueous solutions with and without the presence of bovine serum albumin (BSA) were studied. In the presence of BSA for all studied dyes in the absorption spectra, we observed an increase in the absorption intensity, a small broadening, and a new band of the shorter wavelengths with λmax=412 nm. The intensity of the fluorescence emission of the baseband of the studied dyes in the presence of BSA increased from 1.1 to 4.6 times. The binding constant (K) and the number of binding sites (N) of the studied dyes with BSA were determined. The dependence of the binding constant with BSA on the dipole moment of the dye molecules was determined, which indicated that besides electrostatic attraction forces, hydrophobic interactions are significant between styrylcya¬nine dyes with BSA molecules. It was demonstrated that the aggregation of dyes influences the interactions of dyes with BSA.
      PubDate: 2014-01
       
  • Optical Studies on L-Tartaric acid and L-Prolinium Tartrate

    • Abstract: Optical Studies on L-Tartaric acid and L-Prolinium Tartrate
      Pages 9-14
      Author K. MoovendaranS. NatarajanV. Jayaramakrishna
      Bulk-size single crystals of the nonlinear optical (NLO) materials: L-tartaric acid (LTA) and L-prolinium tartrate (LPT) were grown from aqueous solution using a home made crystal growth setup. Characterization of the crystals was investigated using single crystal X-ray diffraction. UV-vis-NIR spectra showed that the crystals have excellent transparency in the visible and infrared regions. Tentative assignments were made for the IR absorption peaks. The birefringence of the crystals was measured in the visible region and it was found to be varying with wavelength. Photoluminescence excitation studies showed that the emission occurred at 397 and 375 nm respectively, for LTA and LPT. The second harmonic generation (SHG) conversion efficiency of the powder samples of the crystals were measured as about 40% and 95% respectively, compared to that of the standard KDP crystals.
      PubDate: 2014-01
       
  • Shear Bond Strength of Different Adhesive Systems on Enamel Prepared by
           Er: YAG LASER

    • Abstract: Shear Bond Strength of Different Adhesive Systems on Enamel Prepared by Er: YAG LASER
      Pages 1-8
      Author João C. FerreiraSofia Arantes-OliveiraWalter R. DiasPaulo R. MeloPatrícia T. PiresÁlvaro F. Azeved
      To evaluate Shear Bond Strength (SBS) values of different dental adhesives on Er:YAG laser prepared enamel and bur prepared enamel, one hundred and fifty bovine incisors were randomly assigned to SBS tests on enamel (n=15) in ten different groups. Groups 1 to 5 were prepared with Er:YAG laser. Groups 6 to 10 were mechanical prepared. Followed by: Group 1 and 6 – 37% phosphoric acid (PA) + ExciTE®; Group 2 and 7 – AdheSE®; Group 3 and 8 – FuturaBond® NR; Group 4 and 9 – ExciTE®; Group 5 and 10 – Xeno® V. After the adhesive systems samples were subjected to thermal cycling, SBS were performed in an universal testing machine at 5mm/min. Data were treated with two-way ANOVA, and post-hoc test (Student knewman keuls) (p
      PubDate: 2014-01
       
  • All-Optical Implementation of Arithmetic Operation Scheme using Optical
           Nonlinear Material Based Switching Technique

    • Abstract: All-Optical Implementation of Arithmetic Operation Scheme using Optical Nonlinear Material Based Switching Technique
      Pages 37-50
      Author Samir SahuShantanu Dha
      Nonlinear material based all-optical switching mechanism is utilized here to develop the all-optical arithmetic operation scheme. Analog optical signals are converted to the corresponding digital signals by optical tree architectures. First a four bit arithmetic unit has been accessed which is elevated to a higher bit arithmetic unit in course. These circuits can execute innumerable arithmetic operations and remarkably, as they are all-optical and fully parallel in nature. These all-optical arithmetic units can gear up to the highest capability of optical performance in high-speed all-optical computers.
      PubDate: 2014-0
       
  • Near Zero Ultra-flat Dispersion PCF: Properties and Generation of
           Broadband Supercontinuum

    • Abstract: Near Zero Ultra-flat Dispersion PCF: Properties and Generation of Broadband Supercontinuum
      Pages 51-58
      Author Partha Sona MajiPartha Roy Chaudhur
      We present a new design study of ultra-flat near zero dispersion PCF with selectively liquid infiltration with all uniform air-holes in the cladding towards achieving broadband supercontinuum generation (SCG). With rigorous series study of the optimization process we could achieve near zero ultra-flat dispersion as small as 0±0.41 ps/nm/km for broad wavelength range. The optimized near zero ultra-flat dispersion PCF has been targeted for smooth and flat broadband spectrum supercontinuum generation (SCG) for near Infrared (IR) applications. Broadband SC generations corresponding to three different designs of ultra-flat dispersion fiber have been carried out by using picoseconds pulse laser around the first zero dispersion wavelengths (ZDW). The numerical results show that FWHM of around 400 nm with less than a meter long fiber can be achieved with these fibers that cover most of the communication wavelength bands. The proposed design study will be applicable for applications in the field of tomography, Dense Wavelength Division Multiplexing (DWDM) system and spectroscopy applications etc.
      PubDate: 2014-0
       
  • Tunable Selective Liquid Infiltration: Applications to Low Loss
           Birefringent Photonic Crystal Fibers (PCF) and Its Single Mode Realization
           

    • Abstract: Tunable Selective Liquid Infiltration: Applications to Low Loss Birefringent Photonic Crystal Fibers (PCF) and Its Single Mode Realization
      Pages 26-36
      Author Partha Sona MajiPartha Roy Chaudhur
      In this article, we’ve theoretically investigated the application of selective liquid infiltration towards realizing birefringent Photonic Crystal Fiber (PCF) and its operation in the single mode region. Birefringence has been created in a symmetrical structure PCF by infiltrating liquid of certain refractive indices in diagonally opposite air-holes. Different air-hole fraction along with different infiltrating refractive indices has been considered towards studying the effect of the parameters towards birefringence and loss. Cut-off properties for different infiltrating liquid has been performed and it has been found that PCF infiltrated with higher Refractive Indices (RI) liquid is suitable for broader range of single mode operation. The present structure provides very low loss and that can also be minimized with higher number of air-hole rings without affecting the birefringent property. Tunability property of the infiltrating liquid for various temperatures has been studied. By varying the refractive indices of the infiltrating liquid the birefringence can be well tuned. Our research will be useful in designing a birefringent PCF from conventional symmetrical PCF by infiltrating liquids in two diagonally opposite air-holes and proper choice of PCF parameter for single mode operation at a desired wavelength of interest.
      PubDate: 2014-0
       
 
 
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