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Distinct Optical Magnetism in Gold and Silver Probed by Dynamic Metamolecules

Title
Distinct Optical Magnetism in Gold and Silver Probed by Dynamic Metamolecules
Authors
Lee, SungheeWoods, Connor N.Ibrahim, OmarKim, Sung WookPyun, Seung BeomCho, Eun ChulFakhraai, ZahraPark, So-Jung
Ewha Authors
박소정
SCOPUS Author ID
박소정scopus
Issue Date
2020
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY C
ISSN
1932-7447JCR Link

1932-7455JCR Link
Citation
JOURNAL OF PHYSICAL CHEMISTRY C vol. 124, no. 37, pp. 20436 - 20444
Publisher
AMER CHEMICAL SOC
Indexed
SCIE; SCOPUS WOS
Document Type
Article
Abstract
Here, we report plasmonic metamolecules with dynamically controllable optical magnetism. A dynamic meta-molecule (DMM) is constructed by decorating gold or silver nanobeads on a thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) hydrogel sphere, which generates uniform coresatellite-type assembly structures with an interbead distance, allowing for strong interparticle coupling. Experimental and simulation results revealed strong magnetic dipole and quadrupole modes observable in the far field both for gold and silver DMMs when the temperature was set above the lower critical solution temperature (LCST) of PNIPAM. Interestingly, gold DMMs showed stronger and more pronounced magnetic resonances than silver DMMs, despite the general notion that silver nanostructures possess superior plasmonic properties. The strong magnetic coupling and structural uniformity along with the ability to dynamically control the assembly structure allowed us to probe distinct optical magnetism in gold and silver and experimentally observe magnetic quadrupole in solution-phase metamolecules for the first time.
DOI
10.1021/acs.jpcc.0c05943
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자연과학대학 > 화학·나노과학전공 > Journal papers
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