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10 Result(s)

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  1. No Access

    Article

    Optical metamaterials at near and mid-IR range fabricated by nanoimprint lithography

    Two types of optical metamaterials operating at near-IR and mid-IR frequencies, respectively, have been designed, fabricated by nanoimprint lithography (NIL), and characterized by laser spectroscopic ellipsome...

    W. Wu, E. Kim, E. Ponizovskaya, Y. Liu, Z. Yu, N. Fang, Y.R. Shen… in Applied Physics A (2007)

  2. No Access

    Article

    Correlation of Structure and Mechanical Properties of Polyolefin Surfaces by Ir + Visible Sum Frequency Generation Vibrational Spectroscopy and Atomic Force Microscopy

    The surface vibrational spectrum of atactic polypropylene was measured using IR+Visible Sum Frequency Generation (SFG) vibrational spectroscopy, in the temperature range 23 to -50 °C. A sharp rise in the inten...

    D. H. Gracias, D. Zhang, Y. R. Shen, G. A. Somorjai in MRS Online Proceedings Library (1998)

  3. No Access

    Article

    Multiphoton Excitation Studies on GaN with PS Pulses

    We report the observation of UV photoluminescence (PL) from wurtzite GaN by multiphoton excitation. The dependence of the PL intensity on excitation intensity as well as PL excitation measurements with sub-ban...

    I. H. Libon, C. Voelkmann, D. Kim, V. Petrova-Koch… in MRS Online Proceedings Library (1996)

  4. No Access

    Article

    Nonlinear optical studies of surfaces

    A brief overview on second-harmonic generation and sum-frequency generation as surface analytical tools is given with a discussion on the intrinsic limitations of the techniques often encountered in the applic...

    Y. R. Shen in Applied Physics A Solids and Surfaces (1994)

  5. No Access

    Article

    Surface Adsorption Studied by Optical SHG: Soluble Monolayers at the Air/Water Interface

    Optical second harmonic generation (SHG) is applied to investigate the structure of the interfacial layer of soluble surfactants adsorbed to the air/water interface.

    Viola Vogel, C. S. Mullin, Y. R. Shen, M. W. Kim in MRS Online Proceedings Library (1989)

  6. No Access

    Chapter

    Two-Dimensional Phase Transitions of a Surfactant Monolayer

    The phenomenon of phase transitions in two dimensions is of great fundamental interest and has therefore drawn a considerable amount of attention.1,2 Insoluble monomolecular layers at a water-air interface provid...

    Mahn Won Kim, Th. Rasing, Y. R. Shen in Phase Transitions in Soft Condensed Matter (1989)

  7. No Access

    Article

    Interface Studies with Nonlinear Optics

    Th. Rasing, Y. R. Shen in MRS Bulletin (1988)

  8. No Access

    Article

    Nonlinear Optics And Surface Science

    The recent status of applications of nonlinear optics to surface science is reviewed. The basic theory of wave mixing on a surface layer, and the possibility of using various nonlinear optical processes for su...

    Y. R. Shen in MRS Online Proceedings Library (1985)

  9. No Access

    Article

    Four-wave mixing and optical-field-induced helical structure in liquid crystalline materials

    Four-wave mixing with two circularly polarized counter-propagating waves inducing a helical birefringence structure can be used to measure a number of material parameters of a liquid crystalline medium. Applic...

    Peixuan Ye, Y. R. Shen in Applied physics (1981)

  10. No Access

    Article

    Experimental study of self-focusing in a liquid crystalline medium

    We have studied experimentally self-focusing of light in the liquid crystalline mediump-ethoxybenzyldine-p-butylaniline (EBBA). By variation of temperature, the response time of the field-induced refractive index...

    E. G. Hanson, Y. R. Shen, G. K. L. Wong in Applied physics (1977)