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A Circular Nanoslit as a Spin-to-Orbital Angular Momentum Converter
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A Circular Nanoslit as a Spin-to-Orbital Angular Momentum Converter

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Scientific talk I gave at Physics@FOM Veldhoven 2012

Scientific talk I gave at Physics@FOM Veldhoven 2012

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  • 1. A Circular Nanoslit as aSpin-to-Orbital AngularMomentum ConverterPhilip ChimentoGert ‘t HooftEric Eliel
  • 2. Suspiciousbehavior insubwavelengthslits
  • 3. Slit in a metal filmChimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24), 24219.
  • 4. Slit in a metal film Subwavelength “Infinite” in the other in one directionChimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24), 24219.
  • 5. Almost ideal metalTM TE Slit width in λChimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24), 24219.
  • 6. Real metalTM TE Slit width in λChimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24), 24219.
  • 7. Real metal Input state Analyzer rotation Measured output If designed carefully,there is a point where theslit is a quarter-wave plateChimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24), 24219.
  • 8. We roll the slit up into a circlePhoto credit: Dandelion And Burdock, Flickr
  • 9. Space-variant λ/4 plate
  • 10. Space-variant λ/4 plate TE TM TM TE
  • 11. Space-variant λ/4 plateInput: circular p olarization σ+ state
  • 12. Space-variant λ/4 plate Output: ?
  • 13. Transmitted polarization state Schematic
  • 14. Transmitted intensity Experiment
  • 15. Transmitted polarization state Experiment Left-handed elliptical Right-handed elliptical Ellipticity <10%
  • 16. Where did the spin angular momentum disappear to?Photo credit: Cayusa, Flickr
  • 17. Cylindrical symmetry means no angular momentum is transferred to the plate Photo credit: pixaio, sxc.hu
  • 18. Fascinating!What does the far field look like?
  • 19. AngleAngle Far field Intensity (arb. units)
  • 20. Far field No hole in Intensity (arb. units) the middle!Angle Angle
  • 21. Far field Component with the same Component with oppositehandedness as the input (σ+) handedness to the input (σ−)
  • 22. Phase of central spot Component with the same Component with oppositehandedness as the input (σ+) handedness to the input (σ−)
  • 23. A proper calculation +, = +, = mode con- −, verter =
  • 24. A proper calculation +, = +, = mode = + con- verter −, = = = − =
  • 25. A proper calculation +, = +, = mode = + con- verter −, = = = − Total angular momentum remains the same! =
  • 26. We found,constructed, andunderstood a novelspin-to-orbit angularmomentum couplingdevice.
  • 27. Orbital angular momentum ⟨Jspin ⟩ = 0 ̵ ⟨Jorbit ⟩ = h

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