Light-matter coupling in coupled optical microcavities

18 May 2023
Seminars and colloquia
Simpkins Lee
Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU

Jan Suffczynski, Institute of Experimental Physics, University of Warsaw

Seminar series
CMP seminar

Optical microcavities embedding quantum emitters provide a highly attractive system for studies of linear and non-linear phenomena in semiconductors, as well as for a wide range of applications in optoelectronics.
Here, a series of II-VI semiconductor structures comprising two planar microcavities coupled through a semitransparent Bragg mirror, embedding quantum wells (QW), is designed, epitaxially grown, and studied. The doping of the QWs with manganese ions enhances the Zeeman splitting of QW-confined excitons enabling an efficient tuning of their energy. The structures provide an access to a range of exciton-polariton related phenomena, remaining unaddressable with a typically studied non-magnetic, single microcavity.
In the first part of my talk, I will show hybridisation of distant QW-confined excitons resulting from their strong coupling to an optical mode delocalised over two microcavities. Hybridisation enables a transfer of exciton density between distant QWs over an unprecedented distance of above 2 μm.[1] The direction of the transfer is controllable with the magnetic field.[1,2]

Next, I will show such non-linear phenomena in coupled microcavities as Bose-Einstein condensation and energy degenerate parametric scattering of exciton-polaritons.[3,4] The open-dissipative Gross–Pitaevskii equation-based model gives an insight into the processes governing the observed polariton dynamics.

[1] M. Sciesiek,…, JS, Communications Materials 1, 78 (2020).
[2] T. Fas,…, JS, The Journal of Physical Chemistry Letters 12, 7619 (2021).
[3] K. Sawicki,…, JS, Communications Physics 2, 38 (2019).
[4] K. Sawicki,…, JS, Nanophotonics 10(9), 2421 (2021).