Department of Physics, Engineering Physics & Astronomy

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Department of Physics, Engineering Physics & Astronomy
Department of Physics, Engineering Physics & Astronomy

Departmental Colloquium - On-chip nanophotonics:  controlling light at the single photon level

Dr Luca Sapienza,
Department of Physics & Astronomy, University of Southampton (United Kingdom)

Tuesday June 13th, 2017
11:00 a.m. Theatre A

Abstract:

 Solid-state Quantum Optics group

Solid-state quantum emitters are required for quantum information protocols relying on the storage, manipulation, and transmission of the information encoded in single photons through optical cavities and waveguides. Semiconductor quantum dots are particularly promising quantum light sources that can allow both the investigation of fundamental physics phenomena on a chip and quantum technology applications.

I will discuss the implementation of quantum dot nanostructures to create simultaneously bright and pure, on-demand, single-photon sources in engineered nanophotonic structures [1] and hybrid III-V/Silicon quantum photonic devices [2].
I will present different photonic geometries for controlling light propagation, brightness and spontaneous emission rate, based on circular grating cavities [3], metallic rings [4] and photonic crystal waveguides [5].

Finally, I will focus on the comparison between highly engineered structures and disordered media, showing efficient light confinement and optical sensing in the visible range of wavelengths, on a silicon nitride platform [6].

References:

[1] L. Sapienza, M. Davanco, A. Badolato, K. Srinivasan, Nanoscale optical positioning of single quantum dots for bright and pure single-photon emission, Nature Communications 6, 7833 (2015).

[2] M. Davanco, J. Liu, L. Sapienza, C.-Z. Zhang, J.V. De Miranda Cardoso, V. Verma, R. Mirin, S. W. Nam, L. Liu, K. Srinivasan, A heterogeneous III-V/silicon integration platform for on-chip quantum photonic circuits with single quantum dot devices, arxiv.org/abs/1611.07654 (2016).

[3] S. Ates, L. Sapienza, M. Davanco, A. Badolato, K. Srinivasan, Bright single photon emission from a quantum dot in a circular Bragg grating microcavity, IEEE, Journal of selected topics in quantum electronics 18, 1711 (2012).

[4] O.J. Trojak, S.I. Park, J.D. Song, L. Sapienza, Metallic nanorings for broadband, enhanced extraction of light from solid-state emitters, arxiv.org/abs/1704.07640 (2017).

[5] L. Sapienza et al., Cavity quantum electrodynamics with Anderson-localized modes, Science 327, 352 (2010).

[6] T. Crane, O.J. Trojak, L. Sapienza, Anderson localisation of visible light on a nanophotonic chip, arxiv.org/abs/1605.08614v2 (2016).