13 Spinoptics in Plasmonics
471
σ in = -1
σ in
= 1
(b)
(a)
−
+ +
σ
σ
σ +
σ −
(c)
wavelength [nm]
650
700
550
450
500
400
2
6
4
16
14
10
12
8
5 μm
1μm
200nm
intensity enhancement
600
Fig. 13.5 Spin-dependent transmission through annular nanoapertures. a light transmission measured from the element for |λ − ≈, |λ + ≈ + |λ − ≈ and |λ + ≈ illuminations. b SEM picture of the element
used in the experiment. Spiral corrugations are either left-handed or right-handed, depicted with
a counterclockwise or clockwise arrow, respectively. The magnified SEM pictures of a single element and a coaxial nanoaperture are also presented. c spectral transmission enhancement for |λ − ≈
(red line) and |λ + ≈ (blue line). The spectrum was normalized by the transmission measured for
annular apertures without corrugations. Reprinted with permission from Ref. [34]. Copyright 2009
American Chemical Society
the intensity of the transmitted light is enhanced. Accordingly, the word “SPiN”
written with right-handed spirals is lit up when illuminated by |λ − ≈ light. For |λ + ≈
illumination, the contrast is reversed. A spectral transmission through a similarly
structured array of only right-handed spirals, normalized by transmission through
a annular aperture array with-out corrugations manifest a clearly observed resonant
peak for |λ − ≈ illumination around 570 nm. The light transmission at the peak was
found to be enhanced by factor of 16 relative to an uncorrugated aperture array.
The spectral transmission of a |λ + ≈ illumination does not exhibit any substantial
resonance.
471
σ in = -1
σ in
= 1
(b)
(a)
−
+ +
σ
σ
σ +
σ −
(c)
wavelength [nm]
650
700
550
450
500
400
2
6
4
16
14
10
12
8
5 μm
1μm
200nm
intensity enhancement
600
Fig. 13.5 Spin-dependent transmission through annular nanoapertures. a light transmission measured from the element for |λ − ≈, |λ + ≈ + |λ − ≈ and |λ + ≈ illuminations. b SEM picture of the element
used in the experiment. Spiral corrugations are either left-handed or right-handed, depicted with
a counterclockwise or clockwise arrow, respectively. The magnified SEM pictures of a single element and a coaxial nanoaperture are also presented. c spectral transmission enhancement for |λ − ≈
(red line) and |λ + ≈ (blue line). The spectrum was normalized by the transmission measured for
annular apertures without corrugations. Reprinted with permission from Ref. [34]. Copyright 2009
American Chemical Society
the intensity of the transmitted light is enhanced. Accordingly, the word “SPiN”
written with right-handed spirals is lit up when illuminated by |λ − ≈ light. For |λ + ≈
illumination, the contrast is reversed. A spectral transmission through a similarly
structured array of only right-handed spirals, normalized by transmission through
a annular aperture array with-out corrugations manifest a clearly observed resonant
peak for |λ − ≈ illumination around 570 nm. The light transmission at the peak was
found to be enhanced by factor of 16 relative to an uncorrugated aperture array.
The spectral transmission of a |λ + ≈ illumination does not exhibit any substantial
resonance.