期刊
LASER & PHOTONICS REVIEWS
卷 10, 期 2, 页码 287-298出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201500212
关键词
surface plasmon polaritons; plasmonic band gap; plasmonic Bloch modes; second harmonic generation; second order susceptibility
资金
- Swiss National Science Foundation [200020 144383]
- ERA-NET-RUS project QUADSYS
- French government
- Foundation for Polish Science
- National Science Centre Poland [DEC-2012/04/M/ST5/00340]
- Swiss National Science Foundation (SNF) [200020_144383] Funding Source: Swiss National Science Foundation (SNF)
Rectangular arrays of pyramidal recesses coated by silver film are investigated by means of polarization-resolved nonlinear microscopy at 900 nm fundamental wavelength, demonstrating strong dependence of the dipole-allowed SHG upon the lattice parameters. The plasmonic band gap causes nearly complete SHG suppression in arrays of 650 nm periodicity, whereas a sharp resonance at 550 nm periodicity is observed due to excitation of band edge Bloch states at fundamental frequency, accompanied by symmetry-constrained interactions with similar modes at the second-harmonic frequency. Additionally, coupling with modes at the bottom side of the silver film may lead to extraordinary optical transmission, opening a channel for SHG from the highly nonlinear GaAs substrate. Changing the lattice geometry enables SHG intensity modulation over three orders of magnitude, while the effective nonlinear anisotropy can be continuously switched between the two lattice directions, reaching values as high as +/- 0.96.
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