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Plasmonic nanohelix metamaterials with tailorable giant circular dichroism
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Model of a plasmonic nanohelix showing the critical dimension for pitch, major radius, and minor radius as , , and , respectively; (b) On right: 5 SEM images of different individual Cu/Ag helices at different orientations to show morphology; top image enlarged; scale bar 50 nm; (c) schematic of an array of helices showing spacing ϕ.

Image of FIG. 2.
FIG. 2.

(a) CD spectra for Cu helices on a glass substrate with five different pitches indicating a red-shift with respect to an increase in ; (b) normalized CD spectral peaks for the same Cu nanohelices with varying pitch ranging from  = 20, 40, 60, 80, 100 nm; (c) numerical simulations for normalized CD for the five Cu helices. A distinct red-shifting of the spectral peak positions with increased is seen as in (a); inset: peak position vs. wavelength for experiment and simulation in black and red, respectively.

Image of FIG. 3.
FIG. 3.

(a) Total extinction curve of linearly polarized light for substrates with Cu/Ag alloy nanohelices with different seed spacings of  = 53, 62, 69, 76, and 81 nm; inset: SEM top-view with scale-bar 200 nm for  ∼ 76 nm spacing; (b) the effect of changing seed separation on CD which is greatest for the most closely-packed helices and decreases with increasing distance until  = 76; the optical activity for  = 81 nm again increases due to the inability of the seeding at large distances to properly shadow adjacent seeds.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Plasmonic nanohelix metamaterials with tailorable giant circular dichroism