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A Circular Nanoslit as a Spin-to-Orbital Angula...
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Philip Chimento
January 23, 2012
Science
1
170
A Circular Nanoslit as a Spin-to-Orbital Angular Momentum Converter
Scientific talk I gave at Physics@FOM Veldhoven 2012.
Philip Chimento
January 23, 2012
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Transcript
A Circular Nanoslit as a Spin-to-Orbital Angular Momentum Converter Philip
Chimento Gert ‘t Hooft Eric Eliel
Suspicious behavior in subwavelength slits
Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),
24219. Slit in a metal film
Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),
24219. Slit in a metal film Subwavelength in one direction “Infinite” in the other
Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),
24219. Almost ideal metal TM TE Slit width in λ
Chimento, Kuzmin, Bosman, et al. (2011). Opt. Expr. 19 (24),
24219. Real metal TM TE Slit width in λ
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
Photo credit: Dandelion And Burdock, Flickr We roll the slit
up into a circle
Space-variant λ/4 plate
Space-variant λ/4 plate TM TM TE TE
Space-variant λ/4 plate Input: circular polarization σ+ state
Space-variant λ/4 plate Output: ?
Transmitted polarization state Schematic
Transmitted intensity Experiment
Transmitted polarization state Left-handed elliptical Right-handed elliptical Ellipticity <10% Experiment
Photo credit: Cayusa, Flickr Where did the spin angular momentum
disappear to?
Cylindrical symmetry means no angular momentum is transferred to the
plate Photo credit: pixaio, sxc.hu
Fascinating! What does the far field look like?
Far field Angle Angle Intensity (arb. units)
Far field Angle Angle Intensity (arb. units) No hole in
the middle!
Far field Component with the same handedness as the input
(σ+) Component with opposite handedness to the input (σ−)
Phase of central spot Component with the same handedness as
the input (σ+) Component with opposite handedness to the input (σ−)
A proper calculation mode con- verter ѫ +, =
ѫ+ , = ѫ −, =
A proper calculation mode con- verter +TQJO = − I
+PSCJU = I +TQJO = + I +PSCJU = ѫ +, = ѫ+ , = ѫ −, =
A proper calculation mode con- verter +TQJO = − I
+PSCJU = I +TQJO = + I +PSCJU = Total angular momentum remains the same! ѫ +, = ѫ+ , = ѫ −, =
We found, constructed, and understood a novel spin-to-orbit angular momentum
coupling device.
None
None
Orbital angular momentum ⟨Jspin ⟩ = 0 ⟨Jorbit ⟩ =
̵ h