Optical Waveguides with Compound Multiperiodic Grating Nanostructures for Refractive Index Sensing

Table 2

Sensitivities of the dominant resonance peaks for monoperiodic and multiperiodic nanostructures defined in Table 1 as calculated from the spectra in Figures 4–7. Measurement values are averaged values of the results from eight different nanostructures with different duty cycles but the same periodicities as specified in Table 1. The standard deviation is listed for the measurement values.

(a) TE polarization

Structure	nm	(sim.); nm/RIU	(meas.); nm/RIU	(meas.)
M	700	33	32	—
C2	600	15	22	1.3
	770	38	—	—
C3a	610	23	24	2.9
	700	31	31	1.2
	770	37	—	—
C3b	550	12	13	1.4
	700	30	30	1.0
	800	41	—	—
C4	580	12	—	—
	610	22	—	—
	710	24	—	—
	780	37	—	—

(b) TM polarization

Structure	nm	(sim.); nm/RIU	(meas.); nm/RIU	(meas.)
C2	550	25	42	8.7
C3a	550	23	50	1.9
	600	31	28	2.3
C3b	485	44	43	2.6
	600	47	44	1.0
	760	27	—	—
C4	410	22	—	—
	550	46	—	—
	640	49	—	—
	710	43	—	—