期刊
ACS PHOTONICS
卷 6, 期 8, 页码 2110-2116出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b00662
关键词
strong coupling; vibrational resonance; Rabi splitting; hybrid polariton; surface plasmon
类别
资金
- Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom, via the EPSRC Centre for Doctoral Training in Metamaterials [EP/L015331/1]
- European Research Council [ERC-2016-AdG-742222]
We demonstrate strong coupling between surface plasmon resonances and molecular vibrational resonances of poly(methyl methacrylate) (PMMA) molecules in the mid-infrared range through the use of grating coupling, complimenting earlier work using microcavities and localized plasmon resonances. We choose the period of the grating so that we may observe strong coupling between the surface plasmon mode associated with a patterned gold film and the C=O vibrational resonance in an overlying polymer film. We present results from experiments and numerical simulations to show that surface plasmon modes provide convenient open cavities for vibrational strong coupling experiments. In addition to providing momentum matching between surface plasmon modes and incident light, gratings may also produce a modification of the surface plasmon properties, notably their dispersion. We further show that for the parameters used in our experiment surface plasmon stop bands are formed, and we find that both stop-band edges undergo strong coupling.
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