The ab-plane reflectance of a Nd 1.85Ce 0.15CuO 4 single crystal (Tc523 K! has been measured from '35 to 9500 cm 21 at temperatures above and below Tc , and the optical properties calculated from a Kramers-Kronig analysis. A rich phonon spectrum is observed, and there are a number of c-axis infrared and Raman modes that are observed at low temperature which are believed to be activated by disor...

1 Rolf W. Martin, Esslingen University of Applied Sciences, Department of Basic Sciences, Flandernstr. 101, 73732 Esslingen, Germany, [email protected] 2 Otto A. Strobel, Esslingen University of Applied Sciences, Department of Basic Sciences, Flandernstr. 101, 73732 Esslingen, Germany, [email protected] Abstract – A computer based laboratory experiment in the physics lab fo...

Except in a few cases cosmic dust can be studied in situ or in terrestrial laboratories, essentially all of our information concerning the nature of cosmic dust depends upon its interaction with electromagnetic radiation. This chapter presents the theoretical basis for describing the optical properties of dust – how it absorbs and scatters starlight and reradiates the absorbed energy at longer ...

Measurements of optical properties of atmospheric aerosols in Northern Finland V. Aaltonen, H. Lihavainen, V.-M. Kerminen, M. Komppula, J. Hatakka, K. Eneroth, M. Kulmala, and Y. Viisanen Climate and Global Change Research, Finnish Meteorological Institute, P.O. Box 503, 00 101 Helsinki, Finland Department of Applied Environmental Science, Stockholm University, 10 691 Stockholm, Sweden Departme...

S. Dutkiewicz, A. E. Hickman, O. Jahn, W. W. Gregg, C. B. Mouw, and M. J. Follows Center for Global Change Science and Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton, SO14 3ZH, UK Department of Earth, Atmospheric and ...

In this paper, for the first time to our knowledge, we investigate the optical bi-stability in a compact parallel array of micro- ring resonators with 5μm radius, induced by optical nonlinearity. Due to the nature of perfect light confinement, resonance and accumulation process in a ring resonator, optical nonlinear effects, even at small optical power of a few milliwatts in this structure are ...

Static properties, relatively intensity noise and intensity modulation response in quantum cascade lasers (QCLs) studied theoretically in this paper. The present rate equations model consists of three equations for the electrons density in the conduction band and one equation for photons density in cavity length. Two equations were derived to calculate the noise and modulation response. Calcula...

The first year of this project focused on understanding the optical properties of some common viruses. The rationale behind beginning with these types of viruses is that they were easily propagated, they could be grown in large concentrations, and they were simple to enumerate. Viruses were propagated on bacterial host cultures. Size distribution of the viral suspensions were quantified using f...

Cu(In,Ga)Se2 thin films (CIGS) on metallic substrate (titanium, molybdenum, aluminum, stainless steel) were prepared by a two-step selenization of Co-evaporated metallic precursors in Se-containing environment under N2 gas flow. Structural properties of prepared thin film were studied. To characterize the optical quality and intrinsic defect nature low-temperature photoluminescence, were perfor...