Fig. 1. Concept of an integrated fluorescence detection chip for actual application case.

Fig. 2. (a) Schematic diagram of the fluorescence excitation and collection system. Detailed structure of (b) slot waveguide and (c) stripe waveguide; (d) top view of part of the slot waveguide and Y-split waveguide; (e) detailed structure diagram of 1D PC waveguide.

Fig. 3. (a) Graph of the ratio of normalized power in slot versus W_s when W₂ is 130 nm (black dot line), 140 nm (red triangular line), 150 nm (blue square line), 160 nm (green diamond line), and 170 nm (purple hexagonal line) under the wavelength of 520 nm; (b) relationship between propagation loss and W₂; electrical field distributions of the slot waveguide with the wavelengths of (c) 520 nm and (d) 612 nm.

Fig. 4. Propagation of coupled mode in slot when the dipole is polarized in (a) x, (b) y, and (c) z directions.

Fig. 5. (a) Relationship between the efficiency of the slot-stripe converter and the wavelength when the included angle α is 5° (orange line), 10° (blue line), and 15° (green line), separately. The diamond and square marks represent exciting and fluorescent wavelengths. (b) Electrical field distributions of the Y-split waveguide with the wavelengths of (I) 520 nm and (II) 612 nm; (c) relationship between the efficiency of the slot-stripe converter and the wavelength under ideal conditions (blue line) and with the consideration of fabrication accuracy (red line) when the included angle α of the Y-split waveguide is 10°; (d) electrical field distributions of the Y-split waveguide with fabrication accuracy for the wavelength of (I) 520 nm and (II) 612 nm.

Fig. 6. (a) Function of transmittance (green line) and reflectivity (orange line) with different wavelengths; the orange and green dashed lines represent exciting and fluorescent wavelengths, respectively. Electric field distributions of (b) excitation light and (c) fluorescence with OGFCS.