Journal
NANO LETTERS
Volume 16, Issue 12, Pages 7690-7695Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b03760
Keywords
Metamolecules; all-optical modulation; magnetic resonance; gigahertz mechanical resonance; reconfigurable materials
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Funding
- National Science Foundation [EEC-1530734, DBI-1353952, CMMI-0955195, CBET-1055379]
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We report the design of reconfigurable metamolecules consisting a large array of nanowire featuring U-shaped cross section. These nanoscale metamolecules support colocalized electromagnetic resonance at optical frequencies and mechanical resonance at GHz frequencies with a deep-subdiffraction-limit spatial confinement (similar to lambda(2)/100). The coherent coupling of those two distinct resonances manifests a strong optical force, which is fundamentally different from the commonly studied forms of radiation forces, gradient forces, or photothermal induced deformation. The strong optical force acting upon the built-in compliance further sets the stage for allowing the metamolecules to dynamically change their optical properties upon the incident light. The all-optical modulation at the frequency at 1.8 GHz has thus been demonstrated experimentally using a monolayer of metamolecules. The metamolecules were conveniently fabricated using complementary metal-oxide semiconductor-compatible metal deposition and nanoimprinting processes and thus offer promising potential in developing integrated all-optical modulator.
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