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

Scientific talk I gave at Physics@FOM Veldhoven 2012.

January 23, 2012

## Transcript

1. ### A Circular Nanoslit as a Spin-to-Orbital Angular Momentum Converter Philip

Chimento Gert ‘t Hooft Eric Eliel

3. ### Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),

24219. Slit in a metal film
4. ### Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),

24219. Slit in a metal film Subwavelength in one direction “Infinite” in the other
5. ### Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),

24219. Almost ideal metal TM TE Slit width in λ
6. ### Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),

24219. Real metal TM TE Slit width in λ
7. ### Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),

24219. Real metal If designed carefully, there is a point where the slit is a quarter-wave plate Analyzer rotation Input state Measured output
8. ### Photo credit: Dandelion And Burdock, Flickr We roll the slit

up into a circle

16. ### Photo credit: Cayusa, Flickr Where did the spin angular momentum

disappear to?
17. ### Cylindrical symmetry means no angular momentum is transferred to the

plate Photo credit: pixaio, sxc.hu

the middle!
21. ### Far field Component with the same handedness as the input

(σ+) Component with opposite handedness to the input (σ−)
22. ### Phase of central spot Component with the same handedness as

the input (σ+) Component with opposite handedness to the input (σ−)
23. ### A proper calculation mode con- verter ￿ѫ +,￿ = ￿

￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
24. ### A proper calculation mode con- verter ￿+TQJO￿ = −￿ I

￿+PSCJU￿ = ￿ I ￿+TQJO￿ = +￿ I ￿+PSCJU￿ =  ￿ѫ +,￿ = ￿ ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
25. ### A proper calculation mode con- verter ￿+TQJO￿ = −￿ I

￿+PSCJU￿ = ￿ I ￿+TQJO￿ = +￿ I ￿+PSCJU￿ =  Total angular momentum remains the same! ￿ѫ +,￿ = ￿ ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
26. ### We found, constructed, and understood a novel spin-to-orbit angular momentum

coupling device.
27. None
28. None

̵ h