Lecture 14 - Extraordinary optical transmission through very small apertures (student presentation)

Lecture 14 - Extraordinary optical transmission through very small apertures (student presentation)

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Extraordinary optical transmission through very small apertures Lutalo Webb Weiqiang Chen Jie Liu Jan Trieschmann Priyaranga (Ranga) Koswatta
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Outline Background / History Physics Single Hole Apertures Hole Arrays Applications Conclusion 2
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Background Wave propagation through apertures crucial for many applications Imaging, data storage, telecommunication Problems emerge due to decreasing dimensions Smaller dimensions (d < λ ) → classical diffraction theory not sufficient (for our purpose) 3
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Far History Classical diffraction theory well established Christiaan Huygens (1678): “ Traite de la Lumiere Huygens-Fresnel principle Plane wave is superposition of point-sources Dimensions: d ~ λ / 2 Experimental evidence by Thomas Young (1803): “Experiments and Calculations Relative to Physical Optics” 4
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Far History: Physics Aperture on the order of the incident wavelength acts as point source Picture: Wikipedia Parameters Wavelength Aperture size Incident angle Material properties and interaction (e.g. metal) What happens when d << λ? 5
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Recent Past Transmission through sub-wavelength apertures 1944: Bethe 1 predicts transmission T eff / f ~ (d / λ) 4 1998: Ebbesen et al. 2 report “Extraordinary optical transmission through sub- wavelength hole arrays” T eff / f ≥ 2 expected T eff / f ≈ 10 -3 f: area Explanation: Surface plasmons responsible 1 H. A. Bethe, Theory of diffraction by small holes, Phys. Rev. 66, 163-182 (1944) 2 T. W. Ebbesen et al., Extraordinary transmission through sub-wavelength hole arrays, Nature 391, 667 (1998) Picture: K. J. Klein Koerkamp et al., Phys. Rev. Lett. 92, 183901 (2004) 200 nm Ag film on glass substrate P = 900 nm D = 150 nm λ: 100 - 1000 nm regime λ max = 1,370 nm 6
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7 Physics Background
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H. J. Lezec et al., Science 297 , 2002 K. J. Klein Koerkamp et al., PRL 98 , 2004 Coupling surface plasmons
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