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Photonics & Optics

Micronova covers a wide range of photonics research. Micronova's clean room enables fabrication of sophisticated optical structures and components for sensor and telecommunication applications. Measurement facilities enable a comprehensive characterisation of novel materials, structures and components as well as characterisation of optical instruments and optical fiber networks. The fabrication and characterisation facilities are supported by versatile optical modelling tools. Specific areas of photonics expertise in Micronova are novel semiconductor materials, structures and components for optoelectronics, nano-optics, silicon micro- and nanophotonics, fiber optics, spectroscopic measurements, and optical instruments for sensor and space applications. Besides mutual co-operation, Micronova's research groups collaborate with academic and industrial partners both nationally and internationally.

Timo Aalto, timo.aalto@vtt.fi, tel. +358 20 722 6694
Matti Kaivola, matti.kaivola@tkk.fi, tel. +358 9 451 3151
Markku Sopanen, markku.sopanen@tkk.fi, tel. + 358 9 451 3124
Harri Lipsanen, harri.lipsanen@tkk.fi, tel. +358 9 451 3123


Semiconductor Optoelectronics

Compound semiconductor structures based mainly on gallium nitride (GaN) and gallium arsenide (GaAs) are fabricated by metalorganic vapour phase epitaxy (MOVPE). GaN technology is widely studied and applied in the fabrication of visible and UV leds. Novel optoelectronic materials, such as GaInNAs are studied and applied in device structures, like in SESAM´s.

Markku Sopanen, markku.sopanen@tkk.fi, tel. + 358 9 451 3124
Harri Lipsanen, harri.lipsanen@tkk.fi, tel. +358 9 451 3123


Nano-optics

Research focus is in near field optics in the properties of tightly focused fields, in photonic crystals and in nanowires. Micronova has expertise in modelling electromagnetic fields in various nanostructures. Both 2D and 3D photonic crystal structres have been actively studied. Experimental work is done on the detection and spectroscopy of gold nanoparticles that have important applications e.g. in chemical sensing and as labels in biology. Semiconductor nanowires fabricated by guided selfassembly exhibit attractive optical properties.

Jouni Ahopelto, jouni.ahopelto@vtt.fi, tel. + 358 20 722 6644
Matti Kaivola, matti.kaivola@tkk.fi, tel. +358 9 451 3151
Harri Lipsanen, harri.lipsanen@tkk.fi, tel. +358 9 451 3123

Silicon Photonics

Various micro- and nanophotonic components can already be realised by using silicon-on-insulator (SOI) waveguide technology. Photonic integrated circuits based on single-moded SOI waveguides offer low propagation and coupling losses, and in large volumes they can also provide very low costs. On ultra-thin SOI wafers it is also possible to realise photonic crystals and photonic wires. Lasers, detectors and IC-chips can be hybrid-integrated on the SOI platform.

Timo Aalto, timo.aalto@vtt.fi, tel. +358 20 722 6694

Lasers

Work on lasers focuses on the development of miniature diode pumped Q-switched solid state lasers that offer cost-effective pulsed laser sources for applications in nonlinear optics, spectroscopy, and fiber optics. Lasers operating at wavelengths from near-IR to blue have been devised. Efforts have also been directed to developing methods for laser beam shaping exploiting, e.g., nonlinear optical effects in nematic liquid crystals.

Matti Kaivola, matti.kaivola@tkk.fi, tel. +358 9 451 3151

 

Fiber Optics and Optical Networks

Fiber optics research ranges from the development of novel coherent light sources to research on gas sensing technology. These activities are strongly related to the latest advance in optical fiber technology, the so-called photonic crystal fibers. The effort is mainly devoted to the study of photonic crystal fibers properties and applications of these. Research is also done on doped optical fibers and their applications, such as rare-earth doped fiber amplifiers and lasers.

Topologies of fiber optical networks are also studied and suitable passive components for the fiber networks are both compared and developed.

Timo Aalto, timo.aalto@vtt.fi, tel. +358 20 722 6694
Hanne Ludvigsen, hanne.ludvigsen@tkk.fi, tel. +358 9 451 2282

Fluorescence

Fluorescence measurements are applied in chemical, biochemical and biological analyses and are closely related to the research of microfluidistic structures. Measurements are mainly based on LIF (Laser Induced Fluorescence) -method, where laser is used as excitation light source and emitted fluorescence light is measured with photomultiplier and CCD-camera.

Ari Hokkanen, ari.hokkanen@vtt.fi, tel. +358 20 722 4525


Optical Instruments

Optical instruments such as spectrometers and interferometers are developed for biosensing, environmental, industrial and airborne and space applications. Remote sensing and scientific instruments are designed for satellites and aircraft. Micronova has expertise also on the design and manufacturing of optical measurement devices and sensor prototypes (for color, fluorescence, reflectance, distance, thickness, gas concentration, meteorological quantities, pulp consistency, paper properties, etc.).

Heikki Saari, heikki.saari@vtt.fi, tel. +358 722 4360

 

MOEMS

Micronova has expertise for development of Micro-Opto-Electromechanical (MOEMS) elements especially for miniaturized spectrometers, Fabry-Perot and Michelson interferometers and scanning mirrors. One of the major application areas is the utilization of MOEMS components in portable, process measurement Fourier and Fabry-Perot spectrometers.

Heikki Saari, heikki.saari@vtt.fi, tel. +358 722 4360

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