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Sensor properties of planar waveguide structures with grating couplers

Karasiński P.

Opto-Electronics Review

2007

Vol. 15, No. 3

168-178

The paper presents the results of theoretical analysis as well as the results of experimental research involving planar sensor structures with input grating couplers of the period Δ = 800 nm. In the theoretical part of the paper we discussed the influence of the parameters of a sensor structure on it sensitivities. The experimental part of the work presents the results of experimental research involving the influence of refractive index of the cover on the coupling characteristics of sensor structures with grating couplers. The full widths at half maximum (FWHM) were from 0.023° to 0.029°. For the investigated structures we estimated detection thresholds for the changes of refractive index of the cover and the changes of sensitive film thickness. It has been demonstrated that by the application of the elaborated structures we can detect minimal changes of the refractive index (Δnc)min = 2.1×⁻⁶ when the refractive index of the cover nc = 1.333 and (Δnc)min =1.0×⁻⁶ when nc = 1.515. For sensitive films of the thickness w<100 nm, by using the elaborated structures, we can detect mean changes of the thickness along the values lower than 10⁻³ nm.

Tuned liquid crystalline interferometer analysis by means of generalised Berreman matrix

Walczak A., Nowinowski-Kruszelnicki E., Jaroszewicz L., Marciniak P.

Opto-Electronics Review

2002

Vol. 10, No. 1

69-73

The analysis of the tuned, liquid crystalline Fabry-Perot interferometer (FPTI) has been done by means of 4 x 4 matrix. Wide-ange incidence has been analysed in terms of Trollinger-Chipman correction for extraordinary wave. Results have been applied to determine constraints in design of the monochromatic tuned FPTI. Main features of the FPTI device and liquid crystal determining FPTI parameters has been described in detail. Special attention has been paid to dispersion of the LC' refraction indices as a factor of spectral FPFI' properties.