Ms. Danqing Wang Profile

Danqing Wang

at Northwestern Univ

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Proceedings Article | 4 March 2019 Presentation

Nanophotonic integration of hexagonal boron nitride (Conference Presentation)

Minh Nguyen, Sejeong Kim, Toan Trong Tran, Mehran Kianinia, Zai-Quan Xu, Danqing Wang, Ankun Yang, Igor Aharonovich, Milos Toth, Teri Odom

Proceedings Volume 10920, 1092006 (2019) https://doi.org/10.1117/12.2508469

KEYWORDS: Nanophotonics, Boron, Plasmonics, Gold, Luminescence, Single photon, Light-matter interactions, Quantum efficiency, Atomic force microscope, Atomic force microscopy

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The fundamental study and realisation of practical devices for quantum nanophotonic systems stems from the development of hybridised devices, consisting of a single photon source and various other constituents, which aid in controlling light-matter interactions. Emitters hosted within hexagonal boron nitride (hBN) are such a source favoured for this role, owing to its high quantum efficiency, brightness, and robustness. In our work, we explore and demonstrate the integration of hBN emitters with plasmonics, in two distinct arrangements – gold nanospheres, and a gold plasmonic nanocavity array. The former involves the utilisation of an atomic force microscope (AFM) tip to precisely position gold nanospheres to within close proximity to the quantum emitters and observe the resulting emission enhancement and fluorescence lifetime reduction. A fluorescence enhancement of over 300% and a saturated count rate in excess of 5M counts/sec is achieved, emphasising the potential of this material for hybridisation. The latter arrangement involves the direct transfer of a gold plasmonic lattice on top of an emitter hosted within hBN, similarly, to achieve emission enhancement as well as a reduction in fluorescence lifetime and provides an approach for achieving scalable, integrated hybrid systems based on low-loss plasmonic nanoparticle arrays. Both these systems give promising solutions for future employment of quantum emitters in hBN for integrated nanophotonic devices and provide us insight into the complex photodynamics, which envelop the emitters hosted within the material.

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