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In situ tuning of a photonic band gap with laser pulses
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) SEM micrograph of the Au-np-infiltrated opal with spheres. (b) Linear reflectance versus wavelength for an angle of incidence of 30° with respect to the normal. (c) Measured Bragg resonance versus angle of incidence.

Image of FIG. 2.
FIG. 2.

(a) Spectral scans of reflection from an opal infiltrated with Au-np: typical probe response after irradiation for 1280 pump pulses with energy increasing from in steps; the maximum cumulative energy was . (b) Scans of a bare opal PBG: scans after irradiation for 3200 pump pulses of energy from in steps and maximum cumulative energy of . (c) Reflectivity vs total pump energy when probing near the lower (dots) or upper (circles) band edges (d) PBG peak Bragg wavelength vs total pump energy.

Image of FIG. 3.
FIG. 3.

(a) Au concentration vs position (a.u.); the irradiated area corresponds to the shaded region between 7 and 19, the pristine area is from 0 to 6 and above 19; (b) corresponding absorption spectra after opal dissolution. Pristine (black line), irradiated (gray line) areas, and fits (circles) using the Mie–Gans model.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: In situ tuning of a photonic band gap with laser pulses