Plasmonic Nanostructures II

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1 Plasmonic Nanostructures II

2 Dr. Krüger / Prof. M. Zacharias, IMTEK, Propagation of SPPs Propagation distance decreases with decreasing strip width! 2

3 Dr. Krüger / Prof. M. Zacharias, IMTEK, Bound and leaky SPP modes Au strip on SiO 2 substrate: SPP modes can occur on the top (Au-air interface -> leaky mode)) and the bottom (Au- SiO 2 Interface -> bound mode) Both modes can simultaneously carrying information without interacting 3

4 Dr. Krüger / Prof. M. Zacharias, IMTEK, SPPs at IMI/MIM interfaces Comparison of two different waveguide configurations There is a trade-off between confinement and propagation distance of SPPs! 4

5 Dr. Krüger / Prof. M. Zacharias, IMTEK, Absorption of metal nanoparticles Lycurgus Cup in transmission Plasmon-resonance absorption of colliodal Au NPs in reflection Au NP Strength of the free-carrier absorption is pulled into the particle plasmon resonance. 5

6 Dr. Krüger / Prof. M. Zacharias, IMTEK, Absorption of metal nanoparticles Enhanced local electric field in metallic NPs Dependence of plasmon resonsance induced d absorption from size and shape of colloidal Ag NPs Deviation from spherical NP geometry can lead to additional plasmon resonance frequencies 6

7 Dr. Krüger / Prof. M. Zacharias, IMTEK, Absorption of metal nanoparticles From spherical NPs to complex structures 1 excitation mode in spherical NPs 2 excitation mode in non-spherical NPs longitudinal transverse 1 peak 2 peaks derive from 2 resonance frequencies

8 Dr. Krüger / Prof. M. Zacharias, IMTEK, Absorption of metal nanoparticles From spherical NPs to complex structures

9 Dr. Krüger / Prof. M. Zacharias, IMTEK, Light scattering at Au nanoparticles 9

10 Dr. Krüger / Prof. M. Zacharias, IMTEK, Light scattering at metallic NPs conduction electrons confined in small metal particle incident plane wave: electrons move coherently, in phase charge-buildup at particle surface with frequency of wave leads to particle-specific restoring force -> particle dipole plasmon frequence -> redshifted with increasing particle size Polarizability α of a sperical NP with radis a << λ: Polarizability α for ellipsoidal NPs with axes a,b,c : 10

11 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Simulations can be applied New device types for optoelectronics Combination of plasmonic waveguide and plasmonic condensor for focussing Predictions for device development 11

12 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Integration into chips tospeed up data processing 12

13 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Generation and manipulation of electromagnetic radiation Subwavelength aperture Nanolithography 13

14 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Lithography 14

15 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Coupling and polarization effects Sub-wavelength Distance measurements 15

16 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Enhanced flourescence in the presence of a background Chain of metal nanoparticles 16

17 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Core-shell particles as nanoprobes Increased fluorescence intensity: -> waveenth is adjustable FIB structure in Ag film -> sharp light transmission (without structure:-> full scattering) 17

18 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Cancer therapy utilizing core-shell NPs 18

19 Dr. Krüger / Prof. M. Zacharias, IMTEK, Applications for Plasmonics Proposed subwavelength plasmonic microscope Detection of fluorescence Fluorophor labeled sample Nanohole array -> taking of multiple images by moving the nanohole array and reconstruct them Spatial resolution down to 25 nm should be achievable! 19

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