Quantum Optics Seminar by Benjamin P. L. Reid

 Photonic resonators for strong coupling at telecom wavelengths

Benjamin P. L. Reid¹, Frederic S. F. Brossard², Luke Nuttall¹, Stephen Lennon¹, David A. Williams², Matthew Taylor³, Ray Murray³ and Robert Taylor¹

¹ Department of Physics, University of Oxford, 0X1 3PU, Oxford, UK
² Hitachi Cambridge Laboratory, Hitachi Europe Ltd, CB3 0HE, Cambridge, UK
³ Department of Physics, Imperial College, London SW7 2AZ, UK 

Photonic molecules have recently found applications in cavity quantum electrodynamics with the production of strong photon antibunching [1] and coherent control of Rabi oscillations [2] which strongly depend on the coupling strength between the cavities. In this talk I will discuss a scheme to finely tune the mode splitting of coupled photonic crystal cavities based on local perturbation of a photonic crystal waveguide [3]. 

I will also touch on a new development in our group, a method for optical fabrication of microcavities within electron beam defined photonic crystal waveguides. In this method we perform optical lithography using a setup capable of confocal micro-photo-luminescence spectroscopy (µPL), offering the possibility of precisely positioning cavities with a small optical mode volume directly over a quantum dot identified via µPL. The potential combination of these methods could prove a promising route to efficient sources of single and entangled photons near the optical fibre dispersion minimum at 1310 nm.

 [1]       M. Bamba, A. Imamoğlu, I. Carusotto, and C. Ciuti, Phys. Rev. A 83(2), 021802 (2011).
[2]       R. Bose, T. Cai, K. R. Choudhury, G. S. Solomon, and E. Waks, Nat. photonics 8, 858 (2014). 
[3]       F.S.F. Brossard, B.P.L. Reid, C.C.S. Chan, X. L. Xu, J. P. Griffiths, D.A. Williams, R. Murray, and R.A. Taylor, Opt. Express 21, 16934 (2013).