Natallia Strekal. Plasmonic films of noble metals for nanophotonics

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1 Natallia Strekal Plasmonic films of noble metals for nanophotonics

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4 The aim of our investigation is the mechanisms of light interactions with nanostructure and High Tech application in the field of nanophotonics Photonics Plasmonics Nanophotonics Plasmonic structures Applications Optical near field Optical far field State-of-the-art nanophotonics and future developments

5 Photonics - the science of the generation, propagation and detection of optical radiation, in which the photon is considered as the storage medium. An important task is to find new photonics ultrafast radiation management techniques without the help of traditional optical elements (mirrors, lenses, prisms, etc.). The implementation of these methods makes it possible to increase the speed of processing orders and transmission of information, to create all-optical chips

6 Plasmonics The plasmons - electromagnetic waves that propagate along the boundary of the metal and dielectric, whose amplitude decays exponentially with distance from the surface. metal dielectric This means that the plasmon energy is concentrated in the area near the surface at a distance less than the wavelength Optical near-field

7 plasmonic films Plasmonic structures Strekal ND et al Biospectroscopy (2000) plasmonic resonant particles Fofang NT et al Nano Lett. (2008) plasmonic crystals Gaponenko SV et al JETF Lett (2001)

8 Nanophotonics is a science of the interaction of light with nanostructures, where it serves as carrier information Light Nanostructures Information What kind of information? Analyte molecules near the nanoparticles Nanostructure itself Photon states Biospectroscopy Nanotechnology Quantum informatics

9 Plasmonics applications The generation of UV radiation solar cells with increased efficiency particle-biosensors plasmonic integrated circuits

10 Analyte molecules near the nanoparticles Surface plasmon resonance Spectroscopy (SPRS) Surface-enhanced Raman spectroscopy (SERS) Surface-enhanced fluorescence (SEF) Plasmon coupled fluorescence (PCF)

11 (Lane, Nie, 2015)

12 Optical near-field SERS SPF, SPCF L. A. Lane, X. Qian, S. Nie, SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging Chemical Reviews Special Issue: Nanoparticles in Medicine, 2015 (Lane, Nie, 2015)

13 L. A. Lane, X. Qian, S. Nie, SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging Chemical Reviews Special Issue: Nanoparticles in Medicine, 2015 (Lane, Nie, 2015)

14 L. A. Lane, X. Qian, S. Nie, SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging Chemical Reviews Special Issue: Nanoparticles in Medicine, 2015 (Lane, Nie, 2015)

15 acuum post for plasmonic films eposition 2 heating element 1 dielectric substrate 4 vacuum chamber 3 noble metal

16 t= C Annealing of deposited silver or gold films on air in muffle as deposited annealed at t=290 C annealed at t=340 C

17 350 C - annealing temperature - 0 C 400 nm max 700 nm

18 analyte molecules spacer metal island glass

19 CdSe/ZnS nanoparticles

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21 Intensity, r.u. Experimental data on fluorescence enhancement Au direct deposition p s p quartz s nm Fluorescence spectra of mitoxantrone adsorbed onto quartz and plasmonic gold film under 633 nm laser excitation

22 max ads LSPR Extinction spectrum of silver (1) and aqueous solutions of hydrophilic CdSe/ZnS QDs of different sizes (2 5)

23 Histogram of the relative values PL intensity of nanocrystals CdSe / ZnS, precipitated on plasmonic silver film and reference sample (glass) depending on the spectral detuning

24 (1) (2) (3) M. Ohtsu, К. Kobayashi, Optical Near Fields (Springer, Berlin, 2004). pp

25 M. Ohtsu, К. Kobayashi, Optical Near Fields (Springer, Berlin, 2004). pp

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27 An extraordinary fluorescence enhancement for CdSe/ZnS QDs deposited DIRECTLY on the surface of gold plasmonic films can be understood as the result of near field energy leakage in the frame of dressed photon theory. In the optic far field may be detected the effects which take place in the optical near-field, but its clear unterstanding and application need in new level of nanophotonic science.

28 Thank for your attention!

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