Optical Waveguides with Compound Multiperiodic Grating Nanostructures for Refractive Index Sensing

Figure 8

Comparison of measured spectra with air as analyte for structures with varying duty cycle ratios. For these measurements we used a slightly thinner waveguide to investigate the resonances in the visible light regime.

(a) C3a: (meas.)

(b) C3a (meas.)

(c) C3b: (meas.)

(d) C3b: (meas.)