Optics and Photonics
The work includes both theoretical and experimental studies and is carried out in close collaboration with local, national and international research partners. It is funded mostly by the Academy of Finland, private foundations, and direct contracts from industry. The group’s premises are in Micronova, the national micro- and nano-technology center of Finland.
Group leader 2022 -
Dr. Andriy Shevchenko
Group leader 1999 - 2021
Prof. Matti Kaivola
Research
Highlights of recent research
Octupole resonance for local field enhancement
Infinite Q-factors for plasmonic systemsField enhancement by waveguide-plasmon polaritonsNew electromagnetic anapolesCrosstalk reduction between nanowaveguidesMode interference in photonic crystalsEnhancement of fluorescenceNear-field spatial coherenceAberration-insensitive microscopyControl of group velocity of light in free spaceCancellation of optical diffractionPolarization time of unpolarized lightSpatial dispersion and fluorescence in metamaterials
Quadrupole optical metasurface
Suppression of optical diffraction
Open Positions in Optics and Photonics
Open positions in Optics and Photonics
Laboratory Facilities
Inverted microscope Nikon Eclipse TE2000-U
- Brightfield, phase contrast and fluorescence capabilities
- HAMAMATSU ORCA-ER CCD camera
- Piezo transducer for the stage with 1 nm step
Polarizing microscope MT9930, MEIJI TECHNO CO.
- Rotatable stage, full polarization analysis
- Color video camera INFINITY 2, Lumenera Co.
SpectraPro-2500i monochromator/spectrograph, Princeton Instruments/Acton
- Operating range 185 nm – 1400 nm
- Resolution ~0.1 nm
- Includes PIXIS 400 camera (thermoelectric + liquid cooling), 350 nm – 1050 nm
Spectrometer Jobin Yvon (U1000) Raman, HORIBA
- Operation range UV-NIR
- Resolution ~0.01 nm
Ocean Optics spectrometers, fiber-coupled
- HR4000, operation range 200 nm -1100 nm
- USB2000+, operation range 200 nm -1100 nm
- Fiber-coupled light source DH-2000-BAL, 200 nm -1500 nm
CW laser Millenia Xs, Spectra-Physics
- Wavelength 532 nm
- TEM00 transverse mode
- Output power 10 W
CW laser Verdi, Coherent
- Wavelength 532 nm
- Single longitudinal mode (linewidth < 5 MHz)
- Output power 18 W
Mode-locked Ti:sapphire laser Tsunami, Spectra-Physics
- Wavelength 790 nm
- Pumped with Millenia or Verdi
- Pulse duration ~100 fs
- Average power ~1 W
- Peak power ~50 kW
Amplified fs-pulsed laser system
- Coherent Astrella Ti:sapphire oscillator and regenerative amplifier
- Central wavelength 800 nm
- Pulse duration < 35 fs
- Gaussian beam, M2 < 1.3
- Pulse energy > 6 mJ at 1 kHz repetition rate
- TOPAS-Prime Optical Parametric Amplifier, Light Conversion
- Tunable across 290 nm – 1150 nm
- Pulse duration < 50 fs
- Pulse energies: ~ 100 mJ at 480 nm – 1150 nm; > 15 mJ at 290 nm – 480 nm.
CW solid-state laser, 403 nm, CrystaLaser
- Wavelength 403 nm
- Single longitudinal mode (~0.01 nm width, ~1 cm coherence length)
- Output power 40 mW
CW He-Ne lasers, Melles Griot
- Wavelength 633 nm
- TEM00 transverse mode
- Output power ~1 mW
Optical interferometers for characterizing surface movements and vibrations
- Lateral resolution < 1 mm
- Minimum detectable vibration amplitude < 1 pm
- Frequency range from static surfaces up to 6 GHz
Latest publications
Spontaneous symmetry breaking in plasmon lattice lasers
Silica-coated gold nanoshells : Surface chemistry, optical properties and stability
Matrix analysis of high-density arrayed waveguides : Crosstalk suppression by bending
Probing nonradiating states of light in photonic nanostructures using nonlinear optical processes
Temporal Dynamics of Collective Resonances in Periodic Metasurfaces
Semantic segmentation of raw multispectral laser scanning data from urban environments with deep neural networks
Roadmap on photonic metasurfaces
Hybridization of electromagnetic multipoles in a nanoscatterer in the presence of another nanoscatterer
Near-field enhancement of light by higher-order multipole excitations in a metal nanodisc trimer
Octupole plasmon resonance improves light enhancement by a metal nanodimer
Research group members
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