3,402 research outputs found
Plasmonic-photonic crystal coupled nanolaser
We propose and demonstrate a hybrid photonic-plasmonic nanolaser that
combines the light harvesting features of a dielectric photonic crystal cavity
with the extraordinary confining properties of an optical nano-antenna. In that
purpose, we developed a novel fabrication method based on multi-step
electron-beam lithography. We show that it enables the robust and reproducible
production of hybrid structures, using fully top down approach to accurately
position the antenna. Coherent coupling of the photonic and plasmonic modes is
highlighted and opens up a broad range of new hybrid nanophotonic devices
Optical Responses of Localized and Extended Modes in a Mesoporous Layer on Plasmonic Array to Isopropanol Vapor
Mesoporous silica features open and accessible
pores that can intake substances from the outside. The
combination of mesoporous silica with plasmonic nanostructures
represents an interesting platform for an optical sensor based on
the dependence of plasmonic modes on the refractive index of the
medium in which metallic nanoparticles are embedded. However,
so far only a limited number of plasmonic nanostructures are
combined with mesoporous silica, including random dispersion of
metallic nanoparticles and
fl
at metallic thin
fi
lms. In this study, we
make a mesoporous silica layer on an aluminum nanocylinder
array. Such plasmonic arrangements support both localized surface
plasmon resonances (LSPRs) and extended modes which are the
result of the hybridization of LSPRs and photonic modes
extending into the mesoporous layer. We investigate
in situ
optical re
fl
ectance of this system under controlled pressure of
isopropanol vapor. Upon exposure, the capillary condensation in the mesopores results in a gradual spectral shift of the re
fl
ectance.
Our analysis demonstrates that such shifts depend largely on the nature of the modes; that is, the extended modes show larger shifts
compared to localized ones. Our materials represent a useful platform for the
fi
eld of environmental sensingEspaña MINECO grant MAT2017-88584-R
Advances in small lasers
M.T.H was supported by an Australian Research council Future Fellowship research grant for this work. M.C.G. is grateful to the Scottish Funding Council (via SUPA) for financial support.Small lasers have dimensions or modes sizes close to or smaller than the wavelength of emitted light. In recent years there has been significant progress towards reducing the size and improving the characteristics of these devices. This work has been led primarily by the innovative use of new materials and cavity designs. This Review summarizes some of the latest developments, particularly in metallic and plasmonic lasers, improvements in small dielectric lasers, and the emerging area of small bio-compatible or bio-derived lasers. We examine the different approaches employed to reduce size and how they result in significant differences in the final device, particularly between metal- and dielectric-cavity lasers. We also present potential applications for the various forms of small lasers, and indicate where further developments are required.PostprintPeer reviewe
Nanoscale magnetophotonics
This Perspective surveys the state-of-the-art and future prospects of science
and technology employing the nanoconfined light (nanophotonics and
nanoplasmonics) in combination with magnetism. We denote this field broadly as
nanoscale magnetophotonics. We include a general introduction to the field and
describe the emerging magneto-optical effects in magnetoplasmonic and
magnetophotonic nanostructures supporting localized and propagating plasmons.
Special attention is given to magnetoplasmonic crystals with transverse
magnetization and the associated nanophotonic non-reciprocal effects, and to
magneto-optical effects in periodic arrays of nanostructures. We give also an
overview of the applications of these systems in biological and chemical
sensing, as well as in light polarization and phase control. We further review
the area of nonlinear magnetophotonics, the semiconductor spin-plasmonics, and
the general principles and applications of opto-magnetism and nano-optical
ultrafast control of magnetism and spintronics
Boundary effects in finite size plasmonic crystals: Focusing and routing of plasmonic beams for optical communications
Plasmonic crystals, which consist of periodic arrangements of surface features at a metal-dielectric interface, allow the manipulation of optical information in the form of surface plasmon polaritons. Here we investigate the excitation and propagation of plasmonic beams in and around finite size plasmonic crystals at telecom wavelengths, highlighting the effects of the crystal boundary shape and illumination conditions. Significant differences in broad plasmonic beam generation by crystals of different shapes are demonstrated, while for narrow beams, the propagation onto the smooth metal film is less sensitive to the crystal boundary shape. We show that by controlling the boundary shape, the size and the excitation beam parameters, directional control of propagating plasmonic modes and associated beam parameters such as angular beam splitting, focusing power and beam width can be efficiently achieved. This provides a promising route for robust and alignment-independent integration of plasmonic crystals with optical communication components
Tamm plasmon polariton in planar structures: A brief overview and applications
Tamm plasmon provides a new avenue in plasmonics of interface states in
planar multilayer structures due to its strong light matter interaction. This
article reviews the research and development in Tamm plasmon polariton excited
at the interface of a metal and a distributed Bragg reflector. Tamm plasmon
offers an easy planar solution compared to patterned surface plasmon devices
with huge field enhancement at the interface and does not require of any phase
matching method for its excitation. The ease of depositing multilayer thin film
stacks, direct optical excitation, and high-Q modes make Tamm plasmons an
attractive field of research with potential practical applications. The basic
properties of the Tamm plasmon modes including its dispersion, effect of
different plasmon active metals, coupling with other resonant modes and their
polarization splitting, and tunability of Tamm plasmon coupled hybrid modes
under externally applied stimuli have been discussed. The application of Tamm
plasmon modes in lasers, hot electron photodetectors, perfect absorbers,
thermal emitters, light emitting devices, and sensors have also been discussed
in detail. This review covers all the major advancements in this field over the
last fifteen years with special emphasis on the application part
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