Abstract
Single-mode dielectric-loaded surface plasmon-polariton nanowaveguides with strong mode confinement at excitation wavelength of 830 nm and high- Q polymer whispering gallery mode microcavities with surface roughness less than 12 nm have been directly written by two-photon polymerization, which pave the way to fabricate 3D plasmonic photonic structures by direct laser writing.
Highlights
Confinement and manipulation of photons using microcavities like whispering gallery mode (WGM) microcavities have triggered intense research interest
With the rapid development of femtosecond laser systems, direct laser writing by two-photon polymerization (TPP) has emerged as a powerful technique for creating fully 3D micro/nanostructures with sub-diffraction-limit feature-sizes, such as photonic crystals, metamaterials, waveguide-based devices, and MEMS [4,5,6]
The dielectric-loaded surface plasmon-polariton (SPP) waveguides (DLSPPWs) were designed by the effective-index method (EIM) and fabricated by TPP
Summary
Confinement and manipulation of photons using microcavities like whispering gallery mode (WGM) microcavities have triggered intense research interest. Due to the low cost and good biocompatibility of polymer materials, polymer WGM microcavities have attracted increasing interest. The fabrication of these microcavities is primarily based on the conventional lithography that is remarkably successful in producing planar devices via multiple steps. We report the fabrication of dielectric-loaded surface plasmon-polariton (SPP) waveguides (DLSPPWs) on the gold film and high-Q polymer WGM microcavities by TPP. These DLSPPWs with optimal transverse dimensions around 250 nm are single-mode with strong mode confinement at excitation wavelength of 830 nm. The quality factors of the fabricated WGM microcavities with surface roughness less than 12 nm are up to 1.48×105 limited by the material absorption
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