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Anomalous zero-group-velocity photonic bonding states with local chirality

Anomalous zero-group-velocity photonic bonding states with local chirality
Anomalous zero-group-velocity photonic bonding states with local chirality
Chirality is a crucial property to enthrone quantum computation on-chip and thereby engineer efficient deterministic photonic building blocks analogous to gates and transistors. Photonic Crystal Waveguides (PCWs) are promising for this purpose due to circular polarisation points that can unbalance the directionality of a quantum emitter (QE). In non-symmorphic waveguides, the local chirality is prominent and extends into high field intensity regions. Nevertheless, the Purcell effect at circular polarisation points saturates near the band-edge, the preferred region for Quantum ElectroDynamics (QED). Consequently, uni-directionality and ultra-strong light-matter interaction are difficult to combine. Here, we detract from the vicinity of the band-edge, and couple modes with different parities by breaking the mirror symmetry. Simulated bandstructures of the implemented Photonic Bonding States (PBS) display single-mode anomalous zero-group-velocity (ZGV) points with a non-vanishing energy flow far from the band edge, synonymous with an idealistic infinite Purcell Factor. Fabricated devices in Silicon (Si) slabs demonstrate an extremely large slow-down effect. On top of that, their simulated electric field patterns feature circular polarisation points at high field intensity regions where a QE would acquire uni-directional emission behaviour. This method to engineer PBS in PCWs paves the way for outperforming chiral light-matter experiment on-chip.
0740-3224
2356-2363
Sotto, Moise Sala Henri
2e7797fc-4433-4513-bd08-03ab7839452c
Debnath, Kapil
aa01749d-524b-4464-b90a-af072e92a02f
Khokhar, Ali
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Thomson, David
17c1626c-2422-42c6-98e0-586ae220bcda
Saito, Shinichi
14a5d20b-055e-4f48-9dda-267e88bd3fdc
Sotto, Moise Sala Henri
2e7797fc-4433-4513-bd08-03ab7839452c
Debnath, Kapil
aa01749d-524b-4464-b90a-af072e92a02f
Khokhar, Ali
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Thomson, David
17c1626c-2422-42c6-98e0-586ae220bcda
Saito, Shinichi
14a5d20b-055e-4f48-9dda-267e88bd3fdc

Sotto, Moise Sala Henri, Debnath, Kapil, Khokhar, Ali, Thomson, David and Saito, Shinichi (2018) Anomalous zero-group-velocity photonic bonding states with local chirality. Journal of the Optical Society of America B, 35 (10), 2356-2363. (doi:10.1364/JOSAB.35.002356).

Record type: Article

Abstract

Chirality is a crucial property to enthrone quantum computation on-chip and thereby engineer efficient deterministic photonic building blocks analogous to gates and transistors. Photonic Crystal Waveguides (PCWs) are promising for this purpose due to circular polarisation points that can unbalance the directionality of a quantum emitter (QE). In non-symmorphic waveguides, the local chirality is prominent and extends into high field intensity regions. Nevertheless, the Purcell effect at circular polarisation points saturates near the band-edge, the preferred region for Quantum ElectroDynamics (QED). Consequently, uni-directionality and ultra-strong light-matter interaction are difficult to combine. Here, we detract from the vicinity of the band-edge, and couple modes with different parities by breaking the mirror symmetry. Simulated bandstructures of the implemented Photonic Bonding States (PBS) display single-mode anomalous zero-group-velocity (ZGV) points with a non-vanishing energy flow far from the band edge, synonymous with an idealistic infinite Purcell Factor. Fabricated devices in Silicon (Si) slabs demonstrate an extremely large slow-down effect. On top of that, their simulated electric field patterns feature circular polarisation points at high field intensity regions where a QE would acquire uni-directional emission behaviour. This method to engineer PBS in PCWs paves the way for outperforming chiral light-matter experiment on-chip.

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Submitted date: 27 April 2018
Accepted/In Press date: 16 July 2018
e-pub ahead of print date: 4 September 2018
Published date: 1 October 2018

Identifiers

Local EPrints ID: 425357
URI: https://eprints.soton.ac.uk/id/eprint/425357
ISSN: 0740-3224
PURE UUID: d6ba3b2d-240e-4bc5-8baf-5471d5b51cc3
ORCID for Shinichi Saito: ORCID iD orcid.org/0000-0003-1539-1182

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Date deposited: 15 Oct 2018 16:31
Last modified: 20 Jul 2019 00:41

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Contributors

Author: Moise Sala Henri Sotto
Author: Kapil Debnath
Author: Ali Khokhar
Author: David Thomson
Author: Shinichi Saito ORCID iD

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