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.

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Philip Chimento

January 23, 2012
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Transcript

  1. 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
  2. 5.

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

    24219. Almost ideal metal TM TE Slit width in λ
  3. 6.

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

    24219. Real metal TM TE Slit width in λ
  4. 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
  5. 21.

    Far field Component with the same handedness as the input

    (σ+) Component with opposite handedness to the input (σ−)
  6. 22.

    Phase of central spot Component with the same handedness as

    the input (σ+) Component with opposite handedness to the input (σ−)
  7. 23.

    A proper calculation mode con- verter ￿ѫ +,￿ = ￿

    ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
  8. 24.

    A proper calculation mode con- verter ￿+TQJO￿ = −￿ I

    ￿+PSCJU￿ = ￿ I ￿+TQJO￿ = +￿ I ￿+PSCJU￿ =  ￿ѫ +,￿ = ￿ ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
  9. 25.

    A proper calculation mode con- verter ￿+TQJO￿ = −￿ I

    ￿+PSCJU￿ = ￿ I ￿+TQJO￿ = +￿ I ￿+PSCJU￿ =  Total angular momentum remains the same! ￿ѫ +,￿ = ￿ ￿ѫ+ ,￿ = ￿ ￿ѫ −,￿ = ￿
  10. 27.
  11. 28.