Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.243
Publication date: 7th February 2022
Nanometric semi-conductor colloidal nanocrystals, like CdSe/CdS ones, are excellent single photon sources. Their emission is stable and bright, with a spectral bandwidth of the order of Dl=20-30nm. In specific conditions of high excitation or high confinement, their emission is dramatically changed. They lose their single photon source quality, the dynamic of the emission is accelerated. the spectrum becomes very large and can reach a few 100nm. Such condition can be achieved either by exciting at high power the emitters or by coupling them to antennas [1], increasing optical confinement.
By in situ optical lithography using high order Laguerre Gaussian mode, we deterministically positioned a single colloidal CdSe/CdS emitter inside a plasmonic patch antenna. The single nanocrystal embedded in a thin dielectric medium, is sandwiched between a thick gold layer and thin gold patch. We achieve inside plasmonic antennas a high interaction between the emitters and the confined field excited inside the antenna. We observe large modification of emission for quantum inside antennas illustrated by directive emission, high brightness and increased efficiency. We evidence a dramatic increase of absorption cross-section of emitters inside these antennas. At higher excitation, multi excitation recombination becomes radiative and the emission intensity becomes non linear.
[1] Amit Raj Dhawan, Cherif Belacel, Juan U. Esparza-Villa, Michel Nasilowski, Zhiming Wang, Catherine Schwob, Jean-Paul Hugonin, Laurent Coolen, Benoît Dubertret, Pascale Senellart, Agnès Maître, Extreme multiexciton emission from deterministically assembled single emitter subwavelength plasmonic patch antennas, Light: science and application, 9, 33 (2020)
[2] A. R. Dhawan, M. Nasilowski, Z. Wang, B. Dubertret, A. Maitre , sunder review, ,https://hal.archives-ouvertes.fr/hal-03376851, Efficient single-emitter plasmonic patch antenna fabrication by deterministic in situ optical lithography using spatially modulated light (under review)
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