Optical Waveguides with Compound Multiperiodic Grating Nanostructures for Refractive Index Sensing

Figure 1

Schematics of the investigated types of nanostructured optical waveguides for refractive index sensing. A change in the analyte refractive index in the upper hemisphere is detected by changes in the normal-incidence transmission or reflection spectrum. (a) Monoperiodic nanostructure. (b) Compound multiperiodic nanostructure with two periods. (c) Rudin-Shapiro nanostructure. (d) Thue-Morse nanostructure. (e) Fibonacci nanostructure.

(a) Monoperiodic nanostructure (M)

(b) Compound multiperiodic nanostructure (C)

(c) Rudin-Shapiro nanostructure (RS)

(d) Thue-Morse nanostructure (ThM)

(e) Fibonacci nanostructure (F)