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(a)–(c) Layout of a slot-cavity with input/output grating couplers, tapered and ridge waveguides. The excitation laser injection location is labeled. The two smaller “coupling holes” at the end of PC waveguides are visible in (c). (d) The electric field intensity distribution of the slot-cavity from 3D FDTD simulations overlapped with the cavity design. To make the defects in the PC lattice, yellow, red, and green holes are shifted by 12, 8, and 4 nm, respectively. Note that the field in the cavity is almost entirely polarized in the y direction.
(a) Resonant transmission spectra from input to output ridge waveguides through slot-cavity for sample S2 in Table I . The simulation curve is red (right curve) and the experimental data points fitted with a Fano line-shape are plotted in blue (left curve). (b) and (c) Resonant transmission spectra for two different devices in hexane (blue, on the right) and acetone (red, on the left): (b) r = 160 nm, s = 70 nm, nm, , (c) r = 160 nm, s = 90 nm, .
Summary of the results from simulations and transmission measurements on 5 different devices.
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