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An analytical analysis of stress profile in cylindrical nanowires vertically grown on silicon (Si) substrate has been performed. Depending on the lattice-mismatch a tensile stress as high as 1GPa for TiO2 nanowires and a compressive stress of 900MPa for InP nanowires has been obtained. The angular component of stress remains small indicating the nanowires will not be twisted as a result of the substrate-induced...
We present a high power, single-frequency, continuously-tunable, singly-resonant optical parametric oscillator (SRO) based on 80 mm-long MgO-doped PPLN crystal pumped by a continuous-wave Yb-fiber laser. Four-mirror SRO ring-cavity configuration is tunable in the mid-infrared from 3761–3970 nm as well as in near-IR from 1453–1484 nm.
We propose the design of refractive index sensor using hybrid-modes formed due to coupling of Tamm-plasmon-polaritons (TPP) and cavity mode in Ta2O5/SiO2 based distributed Bragg-reflectors (DBR). The cavity mode sensitivity varied from 180 nm/RIU to 310 nm/RIU while the sensitivity of low frequency hybrid TPP mode varied from 70 nm/RIU to 210 nm/RIU.
We present a study on the realization of Tamm Plasmon-polariton in the metal deposited Fibonacci sequence based distributed Bragg reflector. All the simulated results are compared with the regular “DBR-matal” structure constructed with the same materials.
The nonlinear optical (NLO) properties of Tetra-tert-butyl-phthalocyanine (H2PC), Copper (II) Tetra-tert-butyl-phthalocyanine (CuPc) and Zinc (II) Tetra-tert-butyl-Phthalocyanine (ZnPC) thin films have been measured by using a single beam Z-scan technique with 250 fs laser pulse of 1064nm central wavelength at a repetition rate of 664 KHz. The choice of Phthalocyanines (Pc) amongst other organic thin...
We present a comparison of an efficient, single-pass second-harmonic-generation (SHG) of a continuous-wave, single-frequency Yb-fiber laser in a congruently-grown as well as stoichiometrically-grown LiTaO3 crystal. We obtain maximum conversion-efficiency (output-power) of 24% (8.5W) and 36% (14.5W) respectively.
We present an experimental study on measurement of nonlinear refractive index (n2) and nonlinear absorption coefficient (β) of organic liquids when the thermo-optic effects manifest into large nonlinear phase-shifts (Δϕ0) in an open-aperture Z-scan configuration.
Plasmon active metals (gold and silver) along with chalcogenide glass have been used to enhance electric field intensity by 360% thereby significantly affecting the study of biomolecular interactions occurring in the vicinity of metal-analyte interface.
An analysis is presented for appreciating the mechanism of coupling of surface plasmon and bandgap guided modes. A design principle is proposed for designing such geometries and dispersion properties are studied by varying waveguide parameters.
We report stable, continuous-wave, mid-infrared optical-parametric-oscillator based on MgO:PPLN, pumped by Yb-fiber-laser, generating total power of 17.5W at 61% extraction efficiency, in TEM00(M2 Idier <1.24,M2 Signal<1.24) spatial mode with peak-peak idler power stability of 5% over 14 hours.
We present a broadband, high-power, fiber-laser-pumped, continuous-wave optical parametric oscillator for mid-infrared by exploiting extended phase-matching properties of MgO:PPLN. Total powers of 11.3W, with 5.3W broadband mid-infrared idler in excellent beam quality are generated.
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