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color="#000000"><b>Seminar on</b></font></div>
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<div align="center"><font face="Times New Roman"
color="#000000"><b>Modern Optics and Spectroscopy</b></font></div>
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<div align="center"><font face="Times New Roman"
color="#000000"><i><b>Light-matter interaction in nanophotonic
devices</b></i></font></div>
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<div align="center"><font face="Times New Roman"
color="#000000"><b>Marko Loncar</b>, Harvard University</font></div>
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<div align="center"><font face="Times New Roman"
color="#000000">Tuesday, December 2, 2008</font></div>
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<div align="center"><font face="Times New Roman" color="#000000">12:00
- 1:00 p.m.</font></div>
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<div align="center"><font face="Times" color="#000000">Miniaturization
and high-density integration of optical devices can enable fast,
low-loss, compact photonic systems that operate at reduced power
levels. I will review the design, fabrication and characterization of
high quality factor photonic crystal cavities that are capable of
confining photons to ultra-small volumes for long periods of time.
These systems are of great practical interest in areas such as
telecommunications, bio-chemical sensing and quantum information, for
example. At the same time, nano-scale optical devices offer a unique
opportunity to study the interaction of light matter on a nanoscale
level.</font></div>
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<div align="center"><font face="Times" color="#000000">In order to
improve efficiency of quantum-emitters, in particular nitrogen-vacancy
(NV) color centers in diamond nanocrystals (NCs), it is important to
enhance their photon production rate as well as the collection
efficiency of the emitted photons. This can be achieved by
embedding quantum emitters within optical cavities. I will describe
1-D photonic crystal nanocavities with theoretical Q larger than one
million, fabricated in an air-bridge silicon-nitride (refractive index
n=2). These nanocavities are designed to operate near 637 nm in order
to strongly enhance the zero-phonon line (ZPL) emission of an NV
center in diamond NCs while suppressing the in-plane emission into the
phonon side-band. Our results indicate that strong coupling regime
between a NV center in diamond nanocrystal embedded within the cavity
and photons trapped in the cavity is possible. I will also discuss
various nanophotonic structures fabricated in bulk single-crystal
diamond, using both focused-ion beam milling and conventional
fabrication techniques, that are suitable for enhanced collection of
Nitrogen Vacancy (NV) color center photoluminescence. Ultra-high
Q photonic crystal resonators fabricated in suspended silicon beams,
with experimental Q values on the order of one million, will also be
discussed.</font></div>
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<div align="center"><font face="Times New Roman" color="#000000">Grier
Room, MIT Bldg 34-401</font></div>
<div align="center"><font face="Times New Roman"
color="#000000">Refreshments served after the lecture</font></div>
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