Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.220
Publication date: 7th February 2022
Deterministic GHz-rate single photon sources at room-temperature would be essential components for various quantum applications. However, both the slow intrinsic decay rate and the omnidirectional emission of typical quantum emitters are two obstacles towards achieving such a goal which are hard to overcome simultaneously. We solve this challenge by a hybrid approach, using a complex monolithic photonic resonator constructed of a gold nanocone responsible for the rate enhancement, enclosed by a circular Bragg antenna for emission directionality [1,2]. A repeatable process accurately binds colloidal quantum dots to the tip of the antenna-embedded nanocone. As a result we achieve simultaneous 20-fold emission rate enhancement and record-high directionality leading to an increase in the observed brightness by a factor as large as 450 (80) into an NA = 0.22 (0.5). We project that these miniaturised on-chip devices can reach photon rates approaching 1.4´108 single photons/second thus enabling ultrafast light-matter interfaces for quantum technologies at ambient conditions.
We also demostrate a significant progress towards a practical plug-and-play single photon source using giant colloidal quantum dots that show blinkingless emission which is stable over hours, on an antenna device which allows back optical pumping of the quantum dots and a front directional single photon emission with high single photon and an almost unity colllection efficiency [3,4].
Keywords: Single photon sources, quantum dots, quantum optics, quantum information, plasmonics, colloidal nanocrystals
References:
[1] Hamza Abudayyeh and Ronen Rapaport, Quantum Sci. Technol. 2 034004 (2017)
[2] Abudayyeh et al., ACS Nano 15, 11, 17384 (2021)
[3] Abudayyeh, et al., APL Photonics 6, 036109 (2021)
[4] Abudayyeh, et al., ACS Photonics 6, 446 (2019)
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