The nonlinear Fano effect

M. Kroner, A. O. Govorov (), S. Remi, B. Biedermann, S. Seidl, A. Badolato, P. M. Petroff, W. Zhang, R. Barbour, B. D. Gerardot, R. J. Warburton and K. Karrai
Additional contact information
M. Kroner: Ludwig-Maximilians-Universität, 80539 München, Germany
A. O. Govorov: Ohio University, Athens, Ohio 45701, USA
S. Remi: Ludwig-Maximilians-Universität, 80539 München, Germany
B. Biedermann: Ludwig-Maximilians-Universität, 80539 München, Germany
S. Seidl: Ludwig-Maximilians-Universität, 80539 München, Germany
A. Badolato: University of California, Santa Barbara, California 93106, USA
P. M. Petroff: University of California, Santa Barbara, California 93106, USA
W. Zhang: Ohio University, Athens, Ohio 45701, USA
R. Barbour: School of Engineering and Physical Sciences, Heriot-Watt University
B. D. Gerardot: School of Engineering and Physical Sciences, Heriot-Watt University
R. J. Warburton: School of Engineering and Physical Sciences, Heriot-Watt University
K. Karrai: Ludwig-Maximilians-Universität, 80539 München, Germany

Nature, 2008, vol. 451, issue 7176, 311-314

Abstract: Fano effect goes nonlinear The Fano effect is a spectral distortion arising from quantum-mechanical resonance or interference between two competing optical pathways. It is ubiquitous in optical spectroscopy of atoms, solids and semiconductor heterostructures. It indicates how discrete energy states, for example of an atom, are coupled to the continuum of states in its environment. The effect has been widely studied, but usually in a linear regime at low excitation power. A new study uses semiconductor quantum dots to explore the physics of the nonlinear Fano regime. Clear Fano resonances are observed, and they can be tuned by changing the device design or with applied voltages. In the nonlinear regime, visibility of Fano interferences increases dramatically, which could be used as a sensitive probe of the degree of coupling between discrete states and the continuum, which is relevant for example for qubits where coupling to the environment needs to be kept to a minimum.

Date: 2008
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DOI: 10.1038/nature06506

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