5 research outputs found
Metafocusing by a Metaspiral Plasmonic Lens
We designed and realized
a metasurface (manipulating the local geometry) spiral (manipulating
the global geometry) plasmonic lens, which fundamentally overcomes
the multiple efficiency and functionality challenges of conventional
in-plane plasmonic lenses. The combination of spirality and metasurface
achieves much more efficient and uniform linear-polarization-independent
plasmonic focusing. As for functionality, under matched circularly
polarized illumination the lens directs all of the power coupled to
surface plasmon polaritons (SPPs) into the focal spot, while the orthogonal
polarization excites only diverging SPPs that do not penetrate the
interior of the lens, achieving 2 orders of magnitude intensity contrast
throughout the entire area of the lens. This optimal functional focusing
is clearly demonstrated by near-field optical microscopy measurements
that are in excellent agreement with simulations and are supported
by a detailed theoretical interpretation of the underlying mechanisms.
Our results advance the field of plasmonics toward functional detection
and the employment of SPPs in smart pixels, near-field microscopy,
lithography, and particle manipulation
Metafocusing by a Metaspiral Plasmonic Lens
We designed and realized
a metasurface (manipulating the local geometry) spiral (manipulating
the global geometry) plasmonic lens, which fundamentally overcomes
the multiple efficiency and functionality challenges of conventional
in-plane plasmonic lenses. The combination of spirality and metasurface
achieves much more efficient and uniform linear-polarization-independent
plasmonic focusing. As for functionality, under matched circularly
polarized illumination the lens directs all of the power coupled to
surface plasmon polaritons (SPPs) into the focal spot, while the orthogonal
polarization excites only diverging SPPs that do not penetrate the
interior of the lens, achieving 2 orders of magnitude intensity contrast
throughout the entire area of the lens. This optimal functional focusing
is clearly demonstrated by near-field optical microscopy measurements
that are in excellent agreement with simulations and are supported
by a detailed theoretical interpretation of the underlying mechanisms.
Our results advance the field of plasmonics toward functional detection
and the employment of SPPs in smart pixels, near-field microscopy,
lithography, and particle manipulation
Visualization 2: Spin-patterned plasmonics: towards optical access to topological-insulator surface states
media files Originally published in Optics Express on 14 December 2015 (oe-23-25-32759
Supplementary document for Universal visible emitters in nanoscale integrated photonics - 6446497.pdf
Supporting information. Noise analysis, experimental system details, efficiency modelling and experimental retrieval, polarization measurement description