Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-15-25-17214
Timestamp: 2019-04-22 02:37:13+00:00

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We discuss experimental studies of the interaction between a nanoscopic object and a photonic crystal membrane resonator of quality factor Q=55000. By controlled actuation of a glass fiber tip in the near field of the photonic crystal, we constructed a complete spatio-spectral map of the resonator mode and its coupling with the fiber tip. On the one hand, our findings demonstrate that scanning probes can profoundly influence the optical characteristics and the near-field images of photonic devices. On the other hand, we show that the introduction of a nanoscopic object provides a low loss method for on-command tuning of a photonic crystal resonator frequency. Our results are in a very good agreement with the predictions of a combined numerical/analytical theory.
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Fig. 1. Scanning electron micrograph of the heterostructure. The yellow lines mark regions with different lattice constants. a 1=410 nm, a 2=400 nm. (b) Schematics of the experimental arrangement. (c) The unperturbed cavity resonance as measured in the far field. The red curve is a Lorentzian fit to the measured data (black circles). (d) The calculated (FDTD) intensity distribution on resonance in the region marked by the white rectangle in Fig. (a).
Fig. 2. Tiles A through M represent SNOM images of the intensity distribution in the PC structure at different wavelengths indicated in each image. Each image is normalized independently according to the color scale shown.
Fig. 3. Calculated intensity distribution at different wavelengths, based on 3D FDTD simulations supplemented with first-order perturbation calculations to take into account the impact of the fiber tip. At each wavelength, the structure is resonant with the incident laser for selected locations of the tip. The calculation only considered the cavity mode without the waveguide mode. Each image is normalized independently according to the color scale shown.
Fig. 4. a) The peak wavelengths of the detuned cavity resonance as a function of tip location. b) Four examples of the local resonance spectra measured through the SNOM tip at the indicated locations A-D in part (a).

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