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Journals and Conferences
We fabricated polymer photonic crystal band edge lasers using nanoimprint lithography. The laser emission wavelength can be tuned by controlling the lattice constant of the PhCs, covering a wavelength range of 30 nm around 550 nm. Unlike the electron-beam lithography commonly used for patterning nanophotonic structures, NIL offers a cost-efficient, rapid… (More)
control A. Shchepetov, M. Prunnila, F. Alzina, L. Schneider, J. Cuffe, H. Jiang, E. I. Kauppinen, C. M. Sotomayor Torres, and J. Ahopelto VTT Technical Research Centre of Finland, P.O. Box 1000, FI-02044 VTT, Espoo, Finland Catalan Institute of Nanotechnology, Campus de la UAB, 08193 Bellaterra (Barcelona), Spain Nanomaterials Group, Department of Applied… (More)
With the aim of optimizing the stamp geometry, a refined model for simultaneous calculation of the resist viscous flow in nanoimprint lithography (NIL) and the stamp/substrate deformation has been introduced. This model has been realized in the IMPRINT software. The software is designed for use on standard personal computers and provides results well suited… (More)
We have investigated experimentally the effect of lateral confinement of acoustic phonons in ridges as a function of the temperature. Electrical methods are used to generate phonons in 100nm large nanostructures and to probe the nanostructure temperature in the same time, what allows tracking the heat flux generated and its possible deviation from Fourier… (More)
The interaction between plasmons and excitons in photonic crystal structures is demonstrated to benefit the light extraction capabilities of polymer-based light emitting components. An enhancement of up to a factor of 40 is reported in structures fabricated by nanoimprint lithography.
Three-dimensional photonic crystals (PhCs) provide materials for the production of highly efficient light sources. In this respect, the channelling and suppression of the spontaneous emission (SE) due to the anisotropic nature of the photonic band gap (PBG), and band-edge stimulated emission, have been demonstrated. Various attempts have been reported on… (More)
A newly developed nanofabrication technique, namely reverse contact UV nanoimprint lithography, which is a combination of nanoimprint lithography and contact printing lithography is carried out to fabricate the multilayered polymer structures with sub-micrometer features. This method results in resist pattern transfer without a residual layer thereby… (More)
Three-dimensional superstructures are fabricated by means of "reverse" and nanoimprint lithography techniques. The nanoimprint lithography technique is based on the deformation of a thin polymer film with a rigid stamp. First the stamp is pressed into a thin polymer film, which is spin-coated on a substrate, followed by removal of the stamp. The second step… (More)
A method to enhance the light-emission efficiency of organic thin films via nanoimprinted photonic crystals and coupled surface plasmons is reported. The photonic crystal (PhC) is made in a polymer film doped with rhodamine 6G. The photoluminescence (PL) spectra of the sample are investigated.
In his work we investigate the thermoelectric performance of SrTiO<sub>3</sub> thin films doped with Nb grown using pulsed laser deposition on crystalline LaAlO<sub>3</sub> substrates. We show that a large enhancement of the Seebeck coefficient is observed for thin films with thicknesses below 10 nm in accordance with previous publications. In addition, we… (More)