In response to the incident light’s electric
fi eld , the electron density oscillates in the
plasmonic hotspots producing an electric
current. Associated Ohmic losses raise
the temperature of the material within
the plasmonic hotspot above the melting
point. A nanojet and nonosphere ejection
can then be observed precisely from the
plasmonic hotspots.

Optical properties of spherical gold particles with
diameters of 150–650 nm (mesoparticles) are studied by
reflectance spectroscopy. Particles are fabricated by laserinduced
transfer of metallic droplets onto metal and dielectric
substrates. Contributions of higher multipoles (beyond
the quadrupole) in the scattering spectra of individual spherical
particles are experimentally observed. These observations
are performed for particles in a homogeneous environment
and for particles located in air on a metal surface.
Good agreement between calculations on the basis of Mie
theory and experimental results obtained in homogeneous
environment is demonstrated. Multipole resonance features
in the experimental reflection spectra of particles located on
a gold substrate, in the wavelength range of 500–1000 nm,
are discussed and theoretically analyzed on the basis of
finite-difference time-domain simulations. High-resolution
Raman images of mesoparticle pairs at different polarizations
of light are also presented.

In the framework of the discrete dipole approximation we develop a theoretical approach, allowing
analyzing the role of multipole modes in the extinction and scattering spectra of arbitrary shaped
nanoparticles. The main attention is given to the ¯rst multipoles including magnetic dipole and
electric quadrupole moments. The role of magnetic quadrupole and electric octupole modes is
also discussed. The method is applied to nonspherical Si nanoparticles with resonant multipole
responses in the visible optical range, allowing a decomposition of single extinction (scattering)
peaks into their constituting multipole contributions. It is shown by numerical simulations that it
is possible to design silicon particles for which the electric dipole and magnetic dipole resonances
are located at the same wavelength under certain propagation directions of incident light, providing
new possibilities in metamaterial developments

A novel method for high-speed fabrication of large scale periodic arrays of
nanoparticles (diameters 40
200 nm) is developed. This method is based on a combination of
nanosphere lithography and laser-induced transfer. Fabricated spherical nanoparticles are partially
embedded into a polymer substrate. They are arranged into a hexagonal array and can be used for
sensing applications. An optical sensor with the sensitivity of 365 nm/RIU and the figure of merit of
21.5 in the visible spectral range is demonstrated.

Periodic structures of spherical silicon particles are analyzed using the coupled-dipole equations for studying
optical response features and local electromagnetic fields. The model takes into account the electric and
magnetic dipole moments of the particles embedded in a homogeneous dielectric medium. Particles with radius
of 65 nm and larger are considered. It is shown that, due to the large permittivity of silicon, the first two Mie
resonances are located in the region of visible light, where the absorption is small and the extinction is
basically determined by scattering. The main contribution is given by the induced magnetic and electric dipoles
of the particles. Thus, in contrast to metal particle arrays, here is a possibility to combine separately either the
electric or magnetic dipole resonances of individual particles with the structural features. As a result, extinction
spectra can have additional narrow resonant peaks connected with multiple light scattering by the magnetic
dipoles and displaying a Fano-type resonant profile. Reflection and transmission properties of the Si particle
arrays are investigated and the conditions of low light reflection and transmission by the particle arrays are
discussed, as well as the applicability of the dipole approach. It is shown that the light transmission of
finite-size arrays of Si particles can be significantly suppressed at the conditions of the particle magnetic dipole
resonance. It is demonstrated that, using resonant conditions, one can separately control the enhancements of
local electric and magnetic fields in the structures.

We demonstrate flexible and low-cost fabrication
of dielectric-loaded surface plasmon–polariton waveguides.
The waveguide structures are fabricated by two-photon
polymerization of commercially available, spin-coatable
epoxy-based UV-lithographic resist on a metal covered glass
slide. The excitation and guiding properties of the plasmonic
waveguides are investigated in the far-field at a wavelength
of 632.8 nm by imaging the leakage radiation from the
waveguide modes. The optimum bending radius for right
angle bends is measured to 6 μm providing a transmission
of up to 70%. The functionality of more complex Y-splitters
is demonstrated.

A novel approach, to our knowledge, for the fabrication of metallic micro- and nanostructures based on femtosecond
laser-induced transfer of metallic nanodroplets is developed. The controllable fabrication of highquality
spherical gold micro- and nanoparticles with radius of 100–800 nm is realized. In combination with the
two-photon polymerization technique, this approach provides unique possibilities for the realization of plasmonic
components and metamaterials. Polymer woodpile structures filled with gold nanoparticles are demonstrated.
Scattering of surface plasmon polaritons on an individual spherical gold nanoparticle fabricated by the
proposed method is investigated. The obtained results are supported by a numerical modeling using the
Green’s tensor approach.

We experimentally demonstrate mode-selective excitation of laser-written dielectric-loaded surface plasmon
polariton waveguides. The waveguide structures are fabricated by two-photon polymerization of spin-coatable
epoxy-based resist on a metal covered glass slide. The waveguides are excited by illuminating the waveguide
ends with a strongly focused Gaussian laser beam with a wavelength of 632.8 nm and adjustable polarization.
The guiding properties are investigated in the far field by imaging the leakage radiation of the waveguide
modes from the metal–substrate interface. It is observed that different TE and TM waveguide modes can be
selectively excited with high precision. Simultaneous excitation of the plasmonic TM00 and TM01 modes leads
to mode beating and oscillation of the guided intensity between the two sides of the waveguides. In Y-splitters,
this simultaneous excitation of the first two TM modes can be used to control the splitting ratio at the exit
ports of the splitter.