Session
<Sample>
Cavity Quantum Electrodynamics of Semiconductor Quantum Dots for
Quantum Photonics Applications
Wen-Hao Chang
Department of Electrophysics, National Chiao Tung University, Hsinchu, 300 Taiwan
Semiconductor quantum dots (QDs) coupled to an optical microcavity,
known as a cavity quantum electrodynamics (QED) system, have been a research
field of intense investigations. It offers a solid-state system not only for exploring the
fundamentals of light-matter coupling, but also for applications in quantum
information processing, such as single photon sources for quantum cryptography,
entangled photon sources for quantum teleportation, and quantum networks for
quantum computations. In this talk, I will give a review of our recent studies on the
solid-state cavity QED system based semiconductor QDs in monolithic microcavities.
In particular, a new tuning scheme based on externally applied stress to the QDs has
been developed for the control of cavity-QD coupling. The excitonic transitions and
cavity modes can be brought into resonance due to their different energy shift rates
with the applied strain. Spectral signatures of both strong and weak couplings are
clearly observed. The strain tunable device can be used to tune the exciton wavelength
bidirectionally at constant temperatures without affecting the emission rate and line
width of excitons.
Figure 1. The stress tuning device and the signature of strong QD-cavity coupling.
References:
1.
W.-H. Chang, W.-Y. Chen, H.-S. Chang, T. M. Hsu, T.-P. Hsieh and J.-I. Chyi, Phys. Rev. Lett. 96, 117401 (2006).
2.
H. S. Chang, W. Y. Chen, T. M. Hsu, T. P. Hsieh, J. I. Chyi, and W.-H. Chang,
3.
M.-F. Tsai, H. Lin, C.-H. Lin, S.-D. Lin, S.-Y. Wang, S.-J. Cheng, M.-C. Lee, W.-H. Chang, Phys. Rev. Lett. 101, 267402 (2008).
4.
Y. J. Fu, S. D. Lin, M. F. Tsai H. Lin, C. H. Lin, S. Y. Wang, S. J. Cheng, and W.-H. Chang, Phys. Rev. B 81, 113307 (2009).
5.
T.-C. Lin, C.-H. Lin, H.-S. Ling, Y.-J. Fu, W.-H. Chang, S.-D. Lin, C.-P. Lee, Phys. Rev. B 80, Rapid Com. 081304(R) (2009).
6.
H. Lin, J.-H. Chen, S.-S. Chao, M.-C. Lo, S.-D. Lin and W.-H. Chang, Optics Express 18, 23948 (2010).
7.
C.-H. Lin, W.-T. You, H.-Y.Chou, S.-J. Cheng, S.-D. Lin and W.-H. Chang, Phys. Rev. B 83 075317 (2011).
8.
H. Lin, C.-H. Lin, W.-C. Lai, Y.-S. Li, S.-D. Lin and W.-H. Chang, Phys. Rev. B Rapid Com. (accepted).
1
Appl. Phys. Lett. 94, 163111 (2009).