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Mie Resonance Engineering in Meta-Shell Supraparticles for Nanoscale Nonlinear Optics

Bahng, Joong Hwan and Jahani, Saman and Montjoy, Douglas G. and Yao, Timothy and Kotov, Nikolas and Marandi, Alireza (2020) Mie Resonance Engineering in Meta-Shell Supraparticles for Nanoscale Nonlinear Optics. ACS Nano, 14 (12). pp. 17203-17212. ISSN 1936-0851.

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Supraparticles are coordinated assemblies of discrete nanoscale building blocks into complex and hierarchical colloidal superstructures. Holistic optical responses in such assemblies are not observed in an individual building block or in their bulk counterparts. Furthermore, subwavelength dimensions of the unit building blocks enable engraving optical metamaterials within the supraparticle, which thus far has been beyond the current pool of colloidal engineering. This can lead to effective optical features in a colloidal platform with ability to tune the electromagnetic responses of these particles. Here, we introduce and demonstrate the nanophotonics of meta-shell supraparticle (MSP), an all dielectric colloidal superstructure having an optical nonlinear metamaterial shell conformed onto a spherical core. We show that the metamaterial shell facilitates engineering the Mie resonances in the MSP that enable significant enhancement of the second harmonic generation (SHG). We show several orders of magnitude enhancement of second-harmonic generation in an MSP compared to its building blocks. Furthermore, we show an absolute conversion efficiency as high as 10⁻⁷ far from the damage threshold, setting a benchmark for SHG with low-index colloids. The MSP provides pragmatic solutions for instantaneous wavelength conversions with colloidal platforms that are suitable for chemical and biological applications. Their engineerability and scalability promise a fertile ground for nonlinear nanophotonics in the colloidal platforms with structural and material diversity.

Item Type:Article
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URLURL TypeDescription Paper
Bahng, Joong Hwan0000-0003-0997-9625
Jahani, Saman0000-0003-4831-2276
Montjoy, Douglas G.0000-0003-3675-8596
Marandi, Alireza0000-0002-0470-0050
Additional Information:© 2020 American Chemical Society. Received: August 24, 2020; Accepted: November 24, 2020; Published: December 8, 2020. We thank Caltech Biological Imaging Facility - Beckman Institute for granting access to the confocal microscopes. We also thank the staff members (Dr. Andre Collazo and Dr. Giada Spigolon) for their support in the confocal microscopy. We acknowledge support from NSF Grant No. 1846273. Author Contributions: The manuscript was written through contributions of all authors. J.H.B. and S.J. contributed equally. The authors declare no competing financial interest.
Funding AgencyGrant Number
Subject Keywords:colloids, nanostructures, metamaterials, nonlinear optics, Mie resonances
Issue or Number:12
Record Number:CaltechAUTHORS:20200918-102108380
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Official Citation:Mie Resonance Engineering in Meta-Shell Supraparticles for Nanoscale Nonlinear Optics. Joong Hwan Bahng, Saman Jahani, Douglas G. Montjoy, Timothy Yao, Nicholas Kotov, and Alireza Marandi. ACS Nano 2020 14 (12), 17203-17212; DOI: 10.1021/acsnano.0c07127
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:105447
Deposited By: Tony Diaz
Deposited On:18 Sep 2020 18:05
Last Modified:22 Dec 2020 20:52

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