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

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

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

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

    24219. Real metal TM TE Slit width in λ
  4. 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
  5. Far field Component with the same handedness as the input

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

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

    ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
  8. A proper calculation mode con- verter ￿+TQJO￿ = −￿ I

    ￿+PSCJU￿ = ￿ I ￿+TQJO￿ = +￿ I ￿+PSCJU￿ =  ￿ѫ +,￿ = ￿ ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
  9. A proper calculation mode con- verter ￿+TQJO￿ = −￿ I

    ￿+PSCJU￿ = ￿ I ￿+TQJO￿ = +￿ I ￿+PSCJU￿ =  Total angular momentum remains the same! ￿ѫ +,￿ = ￿ ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿