[Jlab-seminars] Fwd: Physics Colloquium March 30th

[Mary Fox]

-------- Forwarded Message --------
Subject: 	Physics Colloquium March 30th
Date: 	Tue, 27 Mar 2018 20:51:26 +0000
From: 	Wilkinson, Ellie V <evwilk at wm.edu>
To: 	physics2017 at physics.wm.edu <physics2017 at physics.wm.edu>
CC: 	undergrads2017 at physics.wm.edu <undergrads2017 at physics.wm.edu>



*_PHYSICS COLLOQUIUM_*

Friday, March 30, 2018

4:00 PM

Small Hall, Room 111

*Bahram Roughani**[ *Host: W. Deconinck]**

Loyola University Maryland
*
Title of Talk: **Raman scattering correlation with crystallographic 
orientation of Si cut off axis***

**

*_Abstract:_**__*

Raman spectroscopy is the inelastic scattering of light by matter, a 
process which provides important insight into the structure and 
properties of materials.  This laser spectroscopy technique provides 
non-destructive and non-contact analysis with high spatial resolution up 
to sub-micron scale and requires no sample preparation.  Raman 
scattering of solids represent vibrational modes that are directly 
linked to the crystal symmetry.  Therefore, intensity analysis of Raman 
modes provides information about crystal properties.  We have leveraged 
this characteristics to develop a new approach in polarized 
backscattered Raman spectroscopy that can identify the crystallographic 
orientation of silicon cut off axis. Our theoretical model is developed 
using Raman tensors for backscattering geometry that predicts variations 
in the backscattering polarized Raman intensity profiles as a function 
of the rotating wafers about the lab z-axis.  A comparison between the 
experimental spectra and theoretical model will be presented, and 
specific Raman spectra signatures that are correlated with the degree of 
off-axis cut for single crystals of Si wafers will be discussed.  Our 
model suggests a quick and nondestructive approach for determining the 
off-axis cut of single crystal Si wafers, which is the most commonly 
used substrate material in semiconducting device fabrications.


*/Cookies & Coffee will be served in Small 122 at 3:30pm/*

******

*Eleonor V. Wilkinson*

Administrative & Office Specialist

William & Mary-Physics
Small Hall, Room 123
300 Ukrop Way
Williamsburg, VA 23185

Telephone: 757-221-3503

Fax: 757-221-3540

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