[MOS] December 9, 2008

[Zina Queen]

Seminar on

Modern Optics and Spectroscopy


Terahertz near-field imaging and spectrocopy

Daniel Mittleman,
  Rice University

Tuesday, December 9, 2008


12:00 - 1:00 p.m.




Apertureless near-field scanning optical microscopy (ANSOM) is one of 
several promising methods for obtaining spatial resolution below the 
diffraction limit at various wavelengths, including in the terahertz 
regime.  By scattering incident light off the junction between a 
probe with a sub-wavelength tip and the surface of a sample, spatial 
resolution on the order of the tip size can be obtained.  In the case 
of a sufficiently small probe tip and a metal substrate, plasmonic 
interaction between the tip and sample provides an enhancement of the 
terahertz near-field in the junction, which can enhance the 
sensitivity of the technique for spectroscopy.  We discuss the use of 
ANSOM for near-field spectroscopy  using broadband terahertz 
radiation.



Grier Room, MIT Bldg 34-401
Refreshments served after the lecture
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