Berlin 2015 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 97: Quantum dots and wires: Pillars and cavities

HL 97.1: Vortrag

Freitag, 20. März 2015, 09:30–09:45, ER 164

Control of spontaneous emission by shaping the vacuum field in coupled cavity systems — •Robert Johne¹, Chao-Yuan Jin², Milo Y. Swinkels², Ron Schutjens², Sartoon Fattah poor², Thang B. Hoang², Leonardo Midolo², Peter J. van Veldhoven², and Andrea Fiore² — ¹Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany — ²COBRA Research Institute, Eindhoven University of Technology, P.O. Box 513, NL-5600MB Eindhoven, The Netherlands

The real-time control of spontaneous emission (SE) is needed to harness cavity quantum electrodynamics processes for quantum information processing. Here we report an approach to the control of spontaneous emission via the ultrafast moulding of the vacuum field in two or three coupled cavities. We provide a first demonstration of this concept in a two-cavity structure where the injection of free carriers in a control cavity changes the mode volume and quality factor seen by semiconductor quantum dots sitting in a target cavity, and report a change in SE intensity by over a factor of two over a 200 ps timescale [1]. In the three-cavity system, tuning of the cavity resonances allows for on/off switching of the light-matter interaction [2] paving the way towards advanced applications in quantum information processing as well as for a new class of gain modulated lasers.

[1] C.-Y. Jin et al., Nature Nanotechnology 9, 886 (2014)

[2] R. Johne et al., submitted