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Original Articles

Sensitivity optimization for the index sensors based on waveguide metallic photonic crystals through angle-resolved tuning

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Pages 16-22 | Received 20 Dec 2012, Accepted 17 Apr 2013, Published online: 14 May 2013

Figures & data

Figure 1. SEM and AFM height images of waveguided MPC structures.

Figure 1. SEM and AFM height images of waveguided MPC structures.

Figure 2. Optical extinction spectra for TE and TM polarizations in air, respectively.

Figure 2. Optical extinction spectra for TE and TM polarizations in air, respectively.

Figure 3. Schematic drawing of the experimental setup.

Figure 3. Schematic drawing of the experimental setup.

Figure 4. Schematic illustration of the definition of the sensor signal.

Figure 4. Schematic illustration of the definition of the sensor signal.

Figure 5. (a)–(g) Optical extinction spectra of glucose/water solutions with the concentration increased from 1% to 10% (W/W) using pure water as the blank sample at different incident angles: (a) 0°, (b) 5°, (c) 10°, (d) 15°, (e) 20°, (f) 25°, (g) 28°. (h) The refractive index of the glucose/water solution measured by an Abbe refractometer with the concentration increased from 1% to 10%.

Figure 5. (a)–(g) Optical extinction spectra of glucose/water solutions with the concentration increased from 1% to 10% (W/W) using pure water as the blank sample at different incident angles: (a) 0°, (b) 5°, (c) 10°, (d) 15°, (e) 20°, (f) 25°, (g) 28°. (h) The refractive index of the glucose/water solution measured by an Abbe refractometer with the concentration increased from 1% to 10%.

Figure 6. Measurements on the amplitude of the sensor signal as a function of the concentration of the sample solution at different angles of incidence. The solid lines show the linear fit to each group of the measurements.

Figure 6. Measurements on the amplitude of the sensor signal as a function of the concentration of the sample solution at different angles of incidence. The solid lines show the linear fit to each group of the measurements.