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Designing photonic structures of nanosphere arrays on reflectors for total absorption
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10.1063/1.4818916
/content/aip/journal/jap/114/8/10.1063/1.4818916
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/8/10.1063/1.4818916
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the structures considered in this work. (a) Periodic array of spheres on a metallic substrate with a thin dielectric spacer. (b) Periodic array of spheres on top of a multilayer Bragg mirror.

Image of FIG. 2.
FIG. 2.

(a) Absorption spectra of light incident normally on a square array, ( = 160 nm), of metallic spheres of radius 70 nm on top of a metallic film, of thickness 100 nm separated by a 10 nm thick SiO layer as depicted in Fig. 1(a) . The calculations are carried out using the modified Drude dielectric function of Eq. (1) (black line), and inverse relaxation time increased by a factor of 4.6 (dashed line) and 10 (gray line). (b) Profile of the electric field intensity, normalized to that of the incoming field, for the system with maximum peak absorption (dashed line of (a)) at the frequency of total absorption.

Image of FIG. 3.
FIG. 3.

(a) Change of the density of photonic states for the structure of Fig. 1(a) with the same parameters as in Fig. 2 but using the modified Drude dielectric function of Eq. (1) with . (b) Black line (left scale): ratio of extracted by fitting the absorption spectra to Eq. (A4) versus the inverse Drude relaxation time, and the dotted line is a linear interpolation. The horizontal line marks the critical coupling condition. Gray line (right scale): Maximum value of the corresponding absorption peak.

Image of FIG. 4.
FIG. 4.

(a) Absorption spectra of light incident normally on a square array of lattice constant 150 nm of Ag spheres of radius 65 nm on top of a Ag film, of thickness 100 nm separated by a 3 nm thick SiO spacer. Absorption spectra for (b) TM and (c) TE polarized light incident at an angle in the xz-plane versus the corresponding x component of the wave vector. The straight lines mark the light line in air.

Image of FIG. 5.
FIG. 5.

(a) The same as in Fig. 4 but with the Ag film and SiO spacer replaced by a dielectric Bragg mirror consisting of six periods of alternated TiO(45 nm)/SiO(65 nm) layers. The gray line in (a) refers to the array of spheres deposited on top of 45 nm thick TiO film on a semi-infinite SiO substrate. Absorption spectra for (b) TM and (c) TE polarized light incident at an angle in the xz-plane versus the corresponding x component of the wave vector. The straight lines mark the light line in air.

Image of FIG. 6.
FIG. 6.

(a) Absorption spectra of light incident normally on a square array, of lattice constant 360 nm, of Si spheres, of radius 170 nm, on top of a 100 nm thick Ag film separated by a 25 nm thick SiO spacer, in air (see Fig. 1(b) ). Absorption for TM (b) and TE (c) polarized light incident at an angle in the x-z plane versus the corresponding x-component of the wavevector. The strong lines mark the light line in air. (d) Electric field intensity profile, normalized to that of the incoming field, associated with the low (d) and the high (e) frequency resonances of Fig. 6(a) .

Image of FIG. 7.
FIG. 7.

(a) Absorption spectra of light incident normally on a square array of dielectric spheres on top of a TiO/SiO Bragg mirror for different values of the dielectric constant of the spheres. : black full line, : red dashed line, : green dashed-dotted line. (b) Ratio of the total to the radiative decay rates for two of the resonances shown in (a), : full line, : dashed line. The horizontal line marks the critical coupling condition. (c) Electric field profile, normalized to that of the incoming field, for spheres with at . (d) Field profile for spheres with at .

Image of FIG. 8.
FIG. 8.

Absorption spectra for a square array of dielectric spheres ( ) on top of a lossless TiO/SiO Bragg mirror for (a) TM and (b) TE polarized light incident at an angle in the xz-plane versus the corresponding x component of the wave vector. The straight lines mark the light line in air.

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/content/aip/journal/jap/114/8/10.1063/1.4818916
2013-08-23
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Designing photonic structures of nanosphere arrays on reflectors for total absorption
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/8/10.1063/1.4818916
10.1063/1.4818916
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