物質科学セミナー
2024 年 4 月 2 日（火）午後 3 時–
3B213 プレゼンテーションルーム

DNA origami-assisted unidirectional meta-emitters based onKerker condition
Jer-Shing Huanga. Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germanyb. Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-SchillerUniversität Jena, D-07743 Jena, Germany.
c. Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan.
d. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.
Email: jer-shing.huang@leibniz-ipht.de

Confining the emission of single quantum emitters into a pre-defined direction is of great interest for theapplications of single-photon sources. Plasmonic nanoantennas enable the control and manipulation ofradiation from single quantum emitters. Previously, we demonstrated top-down fabricated broadband
unidirectional transmitting optical nanoantennas based on the interference of coherent waves from multiple
resonators [1]. However, the performance depends on the number of resonating elements, making the topdown fabricated unidirectional nanoantennas bulky. Recently, DNA origami technology has been used toassemble nanoparticles. In this talk, I will present our recent work on ultracompact DNA origami-assisted
unidirectional nanoantennas (footprint ~ 150 nm) based on Kerker condition [2], i.e., the balanced
interference of the induced electric (ED) and magnetic dipole (MD) in the same structure (Fig. 1a). The metaemitter consists of three gold nanoparticles and a single dye molecule (Atto647N) on a precisely engineered
DNA origami template. To bring the emitter to the center of the gap, the DNA origami was designed tocapture one of the three gold nanospheres (diameter = ~70 nm) on the opposite side of the triangular origami
template (Fig. 1b). Trimer nanoantennas were obtained at high yield (Fig. 1c) and the emission of the single
dye molecule show clear unidirectionality. The largest front-to-back emission ratio (F/B) was found to be
more than 10 dB (Fig.1d). I will also present our finding that intensive and polarized laser illumination canturn DNA molecules into carbon-based emitters with superior brightness [3]. This may offer a convenient
way to create nanoscale emitters at arbitrarily chosen locations.
Figure 1. a) Configuration of the trimer nanoantenna
driven by a single emitter (red arrow). The unidirectionalradiation pattern (blue contour) stems from the balanced
interference of the electric dipole (ED) and magnetic
dipole (MD). b) A schematic showing how the curved
origami template brings the single emitter to the dimer
gap. c) An SEM image of the DNA origami-assisted trimer
nanoantennas. d) Representative emission patterns andSEM images of trimer and dimer antennas. Distinct
directionality (F/B ratio in dB) is found between trimers(purple dots) and dimers (pink dots).

References[1] "Photoluminescence-Driven Broadband Transmitting Directional Optical Nanoantennas" See, K.-M.; Lin,

F.-C.; Chen, T.-Y.; Huang, Y.-X.; Huang, C.-H.; Yeşilyurt, A. T. M.; Huang, J.-S. Nano Lett. 2018, 18, 60026008.
[2] "Unidirectional Meta-Emitters Based on the Kerker Condition Assembled by DNA Origami" Yeşilyurt,A. T. M.; Sanz-Paz, M; Zhu, F.; Wu, X.; Sunil, K. S.; Acuna, G. P.; Huang, J.-S. ACS Nano, 2023, 17, 1918919196.
[3] "Nanoscale Hotspot-Induced Emitters in DNA-Assisted Nanoantennas" Yeşilyurt, A. T. M.; Wu, X.; Tapio,K; Bald, I.; Huang, J.-S. J. Am. Chem. Soc., 2023, 145, 25928–25932.

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