Journal
NANO LETTERS
Volume 12, Issue 12, Pages 6309-6314Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3034174
Keywords
Plasmonics; metamaterials; nanoparticles; polarization conversion
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Funding
- EPSRC (UK)
- Royal Society
- grant FPI of GV
- Spanish MICINN [CONSOLIDER EMET CSD2008-00066, TEC2011-28664-C02-02]
- Engineering and Physical Sciences Research Council [EP/H000917/1, EP/H000917/2] Funding Source: researchfish
- EPSRC [EP/H000917/2, EP/H000917/1] Funding Source: UKRI
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The Hanle effect, one of the first manifestations of quantum theory introducing the concept of coherent superposition between pure states, plays a key role in numerous aspects of science varying from applicative spectroscopy to fundamental astrophysical investigations. Optical analogues of quantum effects help to achieve deeper understanding of quantum phenomena and, in turn, to develop cross-disciplinary approaches to realizations of new applications in photonics. Here we show that metallic nanostructures can be designed to exhibit a plasmonic analogue of the quantum Hanle effect rotation. In the original Hanle effect, time-reversal symmetry is broken by a static magnetic field. We achieve this by introducing dissipative level crossing of localized surface plasmons due to nonuniform losses, designed using a non-Hermitian formulation of quantum mechanics. Such artificial plasmonic atoms have been shown to exhibit strong circular birefringence and circular dichroism which depends on the value of loss or gain in the metal-dielectric nanostructure.
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