Laboratory for optics and thin films

Division of Laser and Atomic R&D (ZLAIR)
Institut Ruđer Bošković
Bijenička cesta 54
10002 Zagreb
Croatia

Telefon: +385-1-468-0246
Faks: +385-1-468-0104

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Laboratory for Optics and Thin Films has two research groups: Group for Thin Film Optics and Group for inverse problems.

The main subjects of research are:

  • deposition and optical characterization of metal island films
  • design and deposition of multilayer systems containing metal island films
  • electric field assisted dissolution of metal island films
  • applications of blind source separation in multispectral data analysis

Marko Filipović

assistant
+385 1 457 1241

Vesna Janicki
PhD

researcher
+385 1 457 1247

Ivica Kopriva
PhD

senior scientist
+385 1 457 1286

Martin Lončarić
Ph.D.

Research Associate
+385 1 456 1063

Krešo Tisaj

+385 1 468 0105

Hrvoje Zorc
Ph.D.

senior scientist
+385 1 468 0246

Nedeljko Zorić

+385 1 456 1063
Group for Thin Film Optics

Metal island films show unique optical properties due to the surface plasmon resonance (SPR) of electrons in metal clusters. They have found applications in biological and chemical sensors, waveguides and absorbers. Varying the conditions in preparation of these films, the structural and geometrical properties of the clusters can be varied, enabling tuning of optical properties of the films.

Electric field assisted dissolution (EFAD) of metal clusters, involving instantaneous application of electric field and increased temperature enables structuring of such films. Three dimensional photonic microstructures are produced by the locally selective EFAD of metal clusters embedded in dielectric multilayer stacks. The produced structures show a highly tailorable optical behaviour that combines the interferential effects of multilayer stacks and the SPR of nondissolved metal clusters. This approach represents a promising method for the production of novel components based on 3D-metallodielectric photonic structures that can be applied for protection against forgery or realization of metamaterials.

Researchers in the Group for Thin Tilm Optics
Projects

2008 - present:  Project “Optical properties of nanostructured layers”, financed by Ministry of Science, Education and Sports of the Republic of Croatia, involves intense work on metal island films.

Selected publications
  1. J. Sancho-Parramon, Near-field coupling of metal nanoparticles under tightly focused illumination, Optics Letters, 36 (2011) 3257-3259.
  2. J. Sancho-Parramon, V. Janicki, H. Zorc, On the dielectric function tuning of random metal-dielectric nanocomposites for metamaterial applications, Optics Express, 18 (2010) 26915-26928.
  3. V. Janicki, J. Sancho-Parramon, F. Peiró J. Arbiol, Three-dimensional photonic microstructures produced by electric field assisted dissolution of metal nanoclusters in multilayer stacks,Applied Physics B: Laser and Optics 89 (2010) 93-98.
  4. J. Sancho-Parramon, Surface plasmon resonance broadening of metallic particles in quasi-static approximation: a numerical study of size confinement and interparticle interaction effects, Nanotechnology 20 (2009) 235706-1-235706-7.
  5. J. Sancho-Parramon, V. Janicki, J. Arbiol, H. Zorc, F. Peiro, Electric field assisted dissolution of metal clusters in metal island films for photonic heterostructures, Applied Physics Letters 92 (2008) 163108-1-163108-3.
Group for Inverse Problems

Two main directions of research in the group are:

  • Algorithms for blind signal processing (independent component analysis, sparse component analysis, nonnegative matrix and tensor factorizations, kernel-based nonlinear blind source separation, blind deconvolution) with applications: in medical image analysis (multi-spectral fluorescent imaging, CT and magnetic resonance imaging), EEG data analysis, hyperspectral remote sensing, chemometrics (extraction of pure components-metabolites from mixtures of NMR and mass spectra).
  • Basis learning methods for sparse representation of signals and algorithms for nonlinear reconstruction of signals sampled in sub-Nyquist regime: applications to missing data reconstruction, denoising and solution of underdetermined blind source separation problem.
Researchers in the Group for Inverse Problems
  1. Varian 3117 evaporation plant with electron beam gun and quartz crystal monitoring (Description)
  2. Perkin Elmer Lambda 25 spectrophotometer with attachment for reflectivity measurements  (Description)
  3. Woolam WVASE spectroscopic ellipsometer (Description)
  4. Ocean Optics HR 4000 spectrophotometer with calibration of intensity over wavelength
  5. Trioptics focal length finder
  6. Furnace Linberg M1100 for annealing to 1200°C
  7. Zemax - software for optical systems design
  8. TfCalc - software for thin film systems design
  9. NKDMatl and NKDStack - software for optical characterization of thin films