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SEM images and emission spectra of unfolded (a), (b) and folded (c), (d) coupled L3 cavities. Measured sizes are a = 437 nm, s = 66 nm, and . Circles filled in red denote the shifted and shrunk-end holes to increase the Q-factor, those filled in green denote the modified holes to achieve the band-folding effect.
Unfolded coupled nanocavities. Near field emission (a) and (f) and photoluminescence spectrum (b) and (e) of two L3 cavities separated by 3 rows of holes. Experimental (c) and (g) and simulated (d) and (h) far field patterns. (a)-(d) Symmetric ( ) mode, and (e)-(h) antisymmetric ( ) mode. Pump power 24 μW. In (a), (f): dashed lines indicate the cavity position.
Same as Fig. 2 for the folded coupled nanocavities. Pump power 29.3 μW.
Laser power as a function of pump power for both symmetric (circles) and anti-symmetric (squares) modes. The inset shows the spectral FWHM of the emission for both modes.
Reflectivity contrast for the symmetric (circles) and the anti-symmetric (squares) modes as a function of the laser position. The probe power is 1.1 μW. Vertical dotted line indicates the cavity positions. The spectra for three emblematic positions, namely left cavity (L), center of the barrier (C), and right cavity (R), are also presented.
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