Subject: Fwd: [ee-doctorate] Oral Exam Announcement: Arka Majumdar
From: Arka Majumdar <arkam@stanford.edu>
Date: Fri, 13 Apr 2012 15:20:51 -0700 (PDT)

 Fri, 13 Apr 2012 15:20:51 -0700 (PDT)


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Subject: [ee-doctorate] Oral Exam Announcement: Arka Majumdar




Solid State Cavity Quantum Electrodynamics with Quantum Dots Coupled to Photonic Crystal
Cavities 

Arka Majumdar 

(Advisor: Prof. Jelena Vuckovic) 

Date: Monday, April 16 th , 2012; Time: 2pm (Refreshment starts at 1:45 pm) 

Venue: Paul G. Allen ( CIS - X ) Auditorium 



Quantum dots (QDs) coupled to optical cavities constitute a scalable, robust, on-chip,
semiconductor platform for probing fundamental cavity quantum electrodynamics. Very
strong interaction between light and matter can be achieved in this system as a result
of the field localization inside sub-cubic wavelength volumes leading to vacuum Rabi
frequencies in the range of 10s of GHz. Such strong light-matter interaction produces
an optical nonlinearity that is present even at single-photon level and is tunable at
a very fast time-scale. This enables one to go beyond fundamental CQED studies and to
employ such effects for building practical information processing devices. My PhD work
has focused on both fundamental physics of the coupled QD-nanocavity system, as well
as on several proof-of-principle devices for low-power optical information processing
based on this platform. 

We have demonstrated the effects of photon blockade and photon-induced tunneling, which
confirm the quantum nature of the coupled dot-cavity system. Using these effects and
the photon correlation measurements of light transmitted through the dot-cavity system,
we identify the first and second order energy manifolds of the Jaynes-Cummings ladder
describing the strong coupling between the quantum dot and the cavity field, and propose
a new way to generate mutli-Fock states with high purity [1]. In addition, the interaction
of the quantum dot with its semiconductor environment gives rise to novel phenomena
unique to a solid state cavity QED system, namely phonon-mediated off-resonant dot-cavity
coupling. We have employed this effect to perform cavity-assisted resonant quantum dot
spectroscopy [2], which allows us to resolve frequency features far below the limit
of a conventional spectrometer. Finally, the applications of such a coupled dot-cavity
system in optical information processing including ultrafast, low power all-optical
switching and electro-optic modulation are explored. With the light-matter interactions
controlled at the most fundamental level, the nano-photonic devices we implemented on
this platform operate at extremely low control powers and could achieve switching speeds
potentially exceeding 10GHz [3]. 

References: 

1. Majumdar et. al., arXiv:1106.1926 (in press, PRA); arXiv:1111.6326 (in press, PRL)
(2011). 

2. Englund, Majumdar et.al., PRL, Vol 104, 073904 (2010); Majumdar et.al., PRB, 82,
045306, (2010); PRB 84, 085309 (2011); PRB 84, 085310 (2011); PRB 84, 195304 (2011);
arXiv:1111.7097; Rundquist, Majumdar et. al., APL 99, 251907 (2011). 

3. Faraon, Majumdar et. al., PRL, Vol 104, 047402 (2010); Majumdar et. al., Optics Express,
Vol 18, pp. 3974-3984 (2010); Englund, Majumdar et. al., PRL, 108, 093604, (2012); Majumdar
et.al., PRA, 85, 033802, (2012). 
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