Colloquium Schedule

Colloquium: Thursday, April 26, 4:10 PM, Lewis Lab 316

Linear and Nonlinear Optical Properties of Aluminum Nitride from THz to UV

Marko Zgonik

Professor of Physics at the Faculty of Mathematics and Physics
University of Ljubljana, Slovenia

AlGaN alloys have unique linear and nonlinear optical characteristics that permit the utilization of these materials in optical devices. The two most important properties are a wide transparency window and large non-linear optical coefficients allowing efficient nonlinear conversion into the blue and UV wavelength regions. AlN is a direct semiconductor with a bandgap of 6 eV. Apart from a small absorption region in the mid IR there is no absorption from DC to 200 nm therefore it may be interesting also for THz applications. Bulk aluminium nitride single crystals are grown by physical vapour transport and contain residual impurities preventing their use in the UV. However good quality AlN layers (waveguides) can be grown by metal–organic chemical-vapor deposition on sapphire substrates. In addition, substrate patterning allows simultaneous growth of domains of different polarities that can be used for quasi phase matched interactions. Our results on bulk and waveguide characterization and second harmonic generation will be reviewed.

Click Here for full announcement

Physics and Astronomy Colloquia are usually scheduled for Thursdays at 4:10 PM in Lewis Lab room 316. Refreshments and snacks are available in the nearby coffee room at 3:45 PM.


Physics Colloquium Schedule for SPRING 2018

Click on Title below for past or upcoming Announcements (where available), and Speaker name for website.        

January 25Chinedu EkumaNaval Research Lab.Computational Capabilities and Concepts for 21st Century Materials and Applications
February 1Brandon AndersonUniv. of ChicagoEngineering Novel Many-Body States in Modulated Condensates
February 8Ryan MishmashPrinceton Univ.Uncovering and Exploiting Emergent Phenomena in Quantum Matter: From Fermionic Spinons to Majorana Fermions
February 15Arghavan Safavi-NainiJILA, NIST, UC BoulderThere and Back Again with Trapped-Ions
February 22Bitan RoyMax Planck Instit. DresdenTopology: A New Viewpoint of Condensed Matter Physics
February 27Jordan HorowitzMITThermodynamic Limits Far from Equilibrium
March 8Gary BernsteinU. PennResults from the Dark Energy Survey
March 15NO COLLOQUIUMSpring Break-
March 22Eleni KatiforiU. PennThe Spectrum of Efficient Venation Phenotypes
March 29           (Feigl Lecture)Steven SquyresCornell Univ.Roving Mars: Spirit, Opportunity and the Exploration of the Red Planet
April 5Andrew StromingerHarvardThe Black Hole Information Paradox
April 12Gino SegreU. PennEnrico Fermi: Architect of the Atomic Age
April 19Waseem BakrPrincetonQuantum Gas Microscopy of Atomic Fermi-Hubbard Systems
April 26Marko ZgonikU. of LjubljanaLinear and Nonlinear Optical Properties of Aluminum Nitride from THz to UV
May 3---
May 10---