Surface Plasmons devices and leakage radiation microscopy

1. Surface Plasmons devices and leakage radiation microscopy A.Drezet (ISIS- Univ. Louis Pasteur, Strasbourg, France) A. Hohenau, D. Koller, F. R. Aussenegg, J.R Krenn Nano - Optics Group ● Institute of Physics ● Univ. Graz, Austria nanooptics.uni-graz.at Marseille , 1.10. 2007

2. Surface Plasmon polaritons (SPPs) at a single interface z SPP Dielectric(Air,SiO2) E,B e Metal (Au,Ag) e Hy Raether, Surface Plasmons (Springer, Berlin, 1988). Genet and Ebbesen, Nature 445, 39 (2007). Drezet et al., Micron38, 427 (2007).

3. SPP dispersion relation on a 70 nm thick gold film Total Internal reflection Au/glass Au/air KSPP Johnson and Christy, PRB 6, 4370 (1972).

4. SPP dispersion relation on a 70 nm thick gold film Au/glass Au/air

5. Leakage Radiation (LR) SPP modes z SPP air Air side e e metal glass LR Glass side LR Hecht et al., PRL 77 ,1889 (1986). A. Bouhelier et al., PRB 63, 155404 (2001).

6. Leakage Radiation cone LR cone SPP LR cone Rough Ag surface H. J Simon, J. K. Guha, Opt. Comm. 18, 391 (1976).

7. NSOM (near field scanning optical microscope) Au SPP SPP Polar. IO O2 LR LR Lens 15 µm CCD

8. Addressing a nanoobject with SPP NSOM 4.2 K l=514 nm SPP R= distance hole-tip (nm) Quantum dots (CdTe/ZnTe) Brun et al., Europhys. Lett. 64 , 634 (2003)

9. Leakage Radiation Microscopy (LRM) laser LRM on 50 nm Au film O1 Au SPP SPP l=800 nm IO O2 LR LR Lens CCD Stepanov et al., Optics Letters 30, 1524 (2005). Hohenau et al., Optics Letters 30 ,893 (2005).

10. SPP 2D Bragg reflectors Bragg condition: Drezet et al., Europhys.Lett. 74, 693 (2006)

11. SPP interferometer 2D dipole model V=1, R= 0.95

12. LRM: Imaging the direct and the Fourier space Drezet et al., APL 89, 091117 (2006).

13. A) SPP dispersion in the direct space Bragg mirror (out of resonance) Bragg condition: (A) T R 20 µm L

14. 1 0 0 20 30 40 10 SPP decay in the direct space (B) 10 µm Intensity (arbitrary units) 0.5 x (µm)

15. B) SPP dispersion in the Fourier space 1 LRM (Fourier) L (A) Intensity (arbitrary units) 0.5 0 7.8 8.0 8.2 k (1/µm) Drezet et al., Appl.Phys.Lett. 89, 091117 (2006).

16. (A) T T R 20 µm L (C) (D) T (a) R L L C) SPP Fourier optics (B) T C L R

17. SPP in plane elliptical cavity Reflectance 90% Interferences Appl.Phys.Lett. 86, 074104 (2005)

18. SPP in plane interferometry D1 D2 Bragg mirror SEM Intensity (a. u.) ridge LRM Phase difference 15 µm Ditlbacher et al.,APL. 81, 1762 (2002). Drezet et al., Plasmonics (2006). Phase difference

19. a e1 e2 550 nm SPP in plane demultiplexer-plasmonic crystal LRM Plasmonic crystal l=750 nm 3 SPP Au b l=800 nm 30 µm Drezet et al., Nanolett. (pub. on line15 mai 2007).

20. SPP in plane Tritter = beam splitter 3 inputs-3outputs LRM (direct) (Fourier) e2 e1 d 500nm 15 µm (Ewald sphere)

21. 10 µm 10 µm F1 F2 10 µm SPP in plane reflection microscope (M=3) theory SPP 2 µm LRM 400 nm Drezet et al. Submitted to Optics letters (2007).

22. 6 µm 2 µm 3 µm Intensity (arb.units) 1 µm 1.4 µm 500 nm 10 µm X (µm)

23. Summary • LRM is a straightforward and reliable technique • for probing SPP fields in direct and Fourier space. • LRM allows precise quantitative analysis of SPP • propagations. • Fast method: alternative to PSTM, NSOM, NFO

24. http://nanooptics.uni-graz.at