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A circular dielectric grating for vertical extraction of single quantum dot emission
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Top, (b) angled, and (c) cross-sectional SEM images of suspended circular dielectric grating structure.

Image of FIG. 2.
FIG. 2.

(Color online) Electric field intensity in the (a) xy and (b) xz planes (log scale). (c) Far-field polar plot for the cavity mode with Λ = 360 nm. (d) Collected power (P col) as a function of varying NA, normalized by the upwards (Pz +) and total (P tot) emitted powers. (e) Calculated vertically extracted power as a function of wavelength, normalized to the homogeneous medium electric dipole power P Hom for d = 0.70t. Continuous lines: upwards (+z) extraction; dotted: downwards (−z). (f) Experimental PL spectra for high QD density devices.

Image of FIG. 3.
FIG. 3.

(Color online) (a) PL spectrum from a low QD density Λ = 360 nm device, for various pump powers. (b) Temperature evolution of spectrum in (a) (25 nW pump). (c) Temperature evolution of excitonic energies. Continuous lines are fits.

Image of FIG. 4.
FIG. 4.

(Color online) (a) PL as a function of pump power for X1, X2, and cavity emission from Fig. 3(a), and two QDs in unpatterned GaAs. Error bars are 95% fit confidence intervals. (b) Solid: X1 lifetime trace with fit. Dotted: lifetime trace for QD embedded in a suspended GaAs waveguide.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A circular dielectric grating for vertical extraction of single quantum dot emission