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Local tuning of photonic crystal cavities using chalcogenide glasses
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Scanning electron microscope image of the photonic crystal cavity fabricated in GaAs before the deposition of . (b) Cavity spectrum before the chalcogenide deposition indicating a quality factor . (c) Schematic of the method for local cavity tuning. A layer of is deposited on top of the photonic crystal cavity. Then, a laser tuned close to the band gap is focused on the cavity, increasing the effective refractive index and causing a resonance redshift.

Image of FIG. 2.
FIG. 2.

(a) Spectra showing the shift of the cavity resonance because of the photodarkening of the thick chalcogenide layer. (b) Time dependence of the cavity resonance for 60 and during the tuning process.

Image of FIG. 3.
FIG. 3.

(a) Spectra showing cavity and QD shifting, as a function of exposure time. The QD lines first shift rapidly, presumably through changing material strain induced by the chalcogenide layer. Soon after, the QD lines become stationary, while the cavity continues to redshift. This data set was taken on a sample with of . (b) Individual scans of QD/cavity tuning show that after strain relaxation, the cavity can be shifted independently of the QDs. Scans 4–7 were taken for when the pump power was temporarily increased to speed up the chalcogenide exposure.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Local tuning of photonic crystal cavities using chalcogenide glasses