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Optical modulation in photonic band gap structures by surface acoustic waves
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View: Figures


Image of FIG. 1.
FIG. 1.

Light dispersion in an unstructured (dashed line) and in an one-dimensional PBG structure. The arrows indicate a direct (a) and an umklapp (b) scattering process induced by a SAW with wave vector , which can be employed for frequency-tunable light filter.

Image of FIG. 2.
FIG. 2.

Dielectric constant (solid line) and dielectric modulation by an acoustic wave (dashed line) in a one-dimension PBG structure consisting of a cavity inserted in-between asymmetric Bragg mirrors.

Image of FIG. 3.
FIG. 3.

Definitions of transmission and reflection coefficients.

Image of FIG. 4.
FIG. 4.

Calculated transmission coefficient for the structure given in Fig. 1 in the absence of a SAW. The sharp line at corresponds to the cavity resonance.

Image of FIG. 5.
FIG. 5.

Calculated transmission coefficient near for the structure given in Fig. 2 with (solid symbols) and without a SAW (open symbols). The wavelength scale is in the vicinity of the cavity resonance displayed in Fig. 4. The dotted line shows the contrast ratio CR.

Image of FIG. 6.
FIG. 6.

Expected contrast ratio of the optical switch as a function the dielectric modulation

Image of FIG. 7.
FIG. 7.

One-dimensional cavity structure modulated by a SAW.

Image of FIG. 8.
FIG. 8.

Proposed two-dimensional PBG structure based on semiconductors.

Image of FIG. 9.
FIG. 9.

Calculated reflection coefficient near the resonance wavelength of for the structure given in Fig. 8 in the absence of a SAW (solid line) and under a SAW with wavelength of for the unshifted [, dashed line] and for the up-shifted [, dotted line] modes.

Image of FIG. 10.
FIG. 10.

Expected total reflection coefficient of the structure of Fig. 8 as a function of .

Image of FIG. 11.
FIG. 11.

Reflection coefficient for the up-shifted mode of the structure of Fig. 8, calculated for three different SAW wavelengths.


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Scitation: Optical modulation in photonic band gap structures by surface acoustic waves