Figure 4 SEM cross section of the fabricated porous-silicon-based DBR photonic crystal. SEM cross section of the fabricated porous-silicon-based DBR photonic crystal with alternating low and high refractive indices n H and n L with individual layer thickness values d H and d L corresponding to the quarter wave condition. Figure

5 Comparison of the simulated AMN-107 price and experimental results for tilting the photonic crystal. Figure 6 Experimental measured spectra for dual tunability. The central wavelength shift in the left part of the plot is due to tilting the photonic crystal up to 30°. The central wavelength shift in the right side of the plot is due to the dual tuning by both tilting and pore-filling of the photonic crystal. Discussion From the simulation (Figure 3) and the

experimental results (Figure 5), it is clearly demonstrated that tilting the photonic crystal causes a shift of the central wavelength to a lower wavelength, i.e., a blue shift of the spectrum. The tunability range of a low-doped porous silicon photonic crystal by tilting was found to be wider than that of the high-doped photonic crystal (Figure 3). This effect can be explained by a difference in refractive index contrast n H/n L for the two doping Emricasan levels, where the low-doped porous silicon photonic crystal has a lower refractive index contrast. The measured spectral shift of the central wavelength as function of tilt angle for the low-doped photonic crystal was found to be in good agreement with the simulation

(Figure 5). The experiment showed that the shift of the central wavelength as a result of tilting is see more instantaneous without any noticeable delay. Tunability by the tilting worked well in a narrow wavelength range limited by tilting angles up to 50°. For higher tilting angles, the integrity of the spectrum tended to fade away due Glycogen branching enzyme to total internal reflection. When the photonic crystal is filled with ethanol vapor, the capillary condensation within the mesoporous layers (pore size of some nanometers) of the photonic crystal occurs and changes the refractive index contrast thereby shifting the central wavelength to a higher wavelength (red shift). The shift of the central wavelength due to pore-filling is higher than the shift resulting due to the tilting. It was also observed that spectral shift due to pore-filling is not instantaneous but has a delay of few seconds depending on how quick the pores are filled with ethanol vapor. As shown in Figure 6, the central wavelength shift in the left part of the plot is due to the tilting the photonic crystal up to 30°. The central wavelength shift in the right side of the plot is due to the dual tuning by both tilting and pore-filling of the photonic crystal.