Optics and Photonics
The research of the Optics and Photonics group covers a range of topics of modern optics and photonics, encompassing various aspects of light-matter interaction, optical coherence and polarization, development of methods to manipulate light with nano- and micro-structures, design and construction of novel light sources, optical metamaterials and optical imaging.
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
Matrix analysis of high-density arrayed waveguides
Extended-depth-of-field microscopy
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
Enhanced Q factor and robustness of photonic bound states in the continuum merging at locally bent trajectories
Huayu Bai, Andriy Shevchenko, Radoslaw Kolkowski
2025
JPhys Photonics
Recovery of topologically robust merging bound states in the continuum in photonic structures with broken symmetry
Huayu Bai, Andriy Shevchenko, Radoslaw Kolkowski
2025
Nanophotonics
Tuning the properties of LiNi0.8Mn0.1Co0.1O2 via atomic layer deposition using different synthetic stages
Alisa R. Bogdanova, Filipp A. Obrezkov, Anna A. Kobets, Xiangze Kong, Ville Miikkulainen, Jouko Lahtinen, Lide Yao, Hua Jiang, Tanja Kallio
2025
Journal of Energy Chemistry
Strong Enhancement of Two-Photon Absorption and Emergence of Unusual Extinction Saturation in Silver Sulfide Quantum Dots Integrated with Gold and Silica Nanostructures
Marta Gordel-Wójcik, Radoslaw Kolkowski, Marcin Nyk, Marek Samoć
2025
ACS Applied Materials and Interfaces
Low-loss resonant nonlinear nanophotonics in the visible spectral range using wafer-bonded crystalline AlInP
R. Kolkowski, S. A. Shahahmadi, S. Novikov, J. Oksanen, A. C. Liapis, H. Bai, T. Stolt, M. Kaivola, A. Shevchenko
2025
Nonlinear nanophotonics with Mie-resonant nanostructures based on wafer-bonded crystalline AlInP - a low-loss χ(2) material
R. Kolkowski, S. A. Shahahmadi, S. Novikov, J. Oksanen, A. C. Liapis, H. Bai, T. Stolt, M. Kaivola, A. Shevchenko
2025
19th International Congress on Artificial Materials for Novel Wave Phenomena, Metamaterials 2025
Resonant nanostructures based on AlInP-a low-loss material platform for nonlinear nanophotonics
Radoslaw Kolkowski, Seyed Ahmad Shahahmadi, Serguei Novikov, Jani Oksanen, Andreas C. Liapis, Huayu Bai, Timo Stolt, Matti Kaivola, Andriy Shevchenko
2025
Atomic layer deposition for protecting lithium metal anodes to high-voltage battery applications
Sara Pakseresht, Ville Miikkulainen, Filipp A. Obrezkov, Ahmed Waleed Majeed Al-Ogaili, Jouko Lahtinen, Tanja Kallio
2025
Journal of Power Sources
Exploring the Catalytic Activity and Deactivation Pathway of Fluoride-Doped Copper Manganese Oxides for the Oxygen Evolution Reaction
Moritz Karl Rosenthal, Kateřina Minhová Macounová, Lilian Moumaneix, Eeva-Leena Rautama, Jouko Lahtinen, Petr Krtil, Tanja Kallio
2025
ChemElectroChem
Optical near-field enhancement by metal particles at higher-order plasmon resonances
Sagar Sehrawat, Andriy Shevchenko
2025
Research group members
