Waveguide thickness

Figure 4. Dispersion curve vs. cladding index for SPP-configuration at X=0.6(im, substrate s=1.45, waveguide thickness 4 rm, An=0.01, buffer index 1.40, buffer thickness O.Spm, Au thickness 50nm.

Figure 4. Phase matched SHG at a certain waveguide thickness.

Fig. 6 Theoretical sensitivities of waveguides depending on the waveguide thickness, (a) to cover refractive index changes, (b) to surface adlayer changes with ris = 1.52, n = 2.1, ric = 1.333 at = 675 nm [8]...

Fig. 7 Theoretical light intensities in the evanescent field as the fraction of the total light intensity in the waveguide versus waveguide thickness. Parameters for calculation s = 1-52, n = 2.1, Uc = 1.333 at Xo = 675 nm...

Since the incremental changes of the mass coverage and the refractive index are different depending on the wavelength and the waveguide thickness, there are two equations to determine the unknown quantities AF and Awad-... 

Weff Effective waveguide thickness m Mode number... 

Depending on factors discussed as follows, this matching of modes can lead to an extremely eflScient second harmonic generation. Figure 6.14 shows a hypothetical plot of phase-matching thickness versus waveguide thickness. 

The extent of the evanescent field can be tailored by the design of the waveguide (thickness and refractive index), the wavelength, its cladding and... 

Fig. 14.40 Graph of the sensitivity (ratio of the TM modes. Substrate index 1.46, waveguide change of waveguide effective index to change index 2.00 and cover layer index 1.333 calcu-in refractive index of cover layer) as a function lated for illumination at 660 nm. of waveguide thickness for the first four TE and...

P power of fundamental wave, L waveguide interaction length. b waveguide width, t waveguide thickness, AP = - 2/3 , = 2jtA W, /5 = 4jcA W , f = wave-... 

The SHG efficiency depends critically on the phase integral (Eq. 17), as already mentioned. Ideally, phase matching is achieved when the phase mismatch A/3 is zero. This mismatch, however, depends on several parameters, e.g., the waveguide thickness h and width W, the refractive index , and the temperature T. In real devices, each of these parameters p is subject to fluctuations, causing the efficiency to drop. In order to investigate the sensitivity of the phase matching condition and calculate acceptable tolerances, the mismatch is expanded into a Taylor series to second order around the phase matching point... 

---