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(Color online) (a) Spatial distribution of the PL signal associated with the M1 mode at low power (P = 0.1 mW). (b) Map of the temperature gradient obtained with high excitation density. (P = 2.7 mW). It faithfully describes the laser induced heating using the M1 resonance as a local thermometer, as is more evident from the monochromatic PL maps reported at 0.5 nm steps from the highest wavelength (c) to the lowest (j).
(Color online) Spatial profile of the calculated temperature gradient at the top surface of the PhC nanocavity at a laser irradiation power of 0.7 mW (λ = 516 nm) obtained with FEM simulation. The inset represents the calculated spatial 2D map (5 × 5 μm2) of the temperature gradient.
(Color online) (a) PL spectra of the PhC nanocavity acquired at low power after different exposition times to a high power green laser (P = 0.7 mW). (b) M1 blue shift data plotted vs. the square root of the time for both excitation wavelengths.
(Color online) (a) Topography image (2.5 × 2.0 μm2) of the D2 cavity after a laser exposure corresponding to an overall shift of 13 nm of the photonic modes; a protrusion is observed inside the dotted circle due to the laser spot local oxidation. (b) Line profile of (a) allows to evaluate the height of the oxidized region being approximately 20 nm. The red dashed line is a guide to the eyes obtained through a FFT low pass filter.
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