Photonic wires

Densmore, A. Xu, D. X. Waldron, P. Janz, S. Cheben, P. Lapointe, J. Delage, A. Lamontagne, B. Schmid, J. H. Post, E., A silicon on insulator photonic wire based evanes cent field sensor, IEEE Photon. Technol. Lett. 2006, 18, 2520 2522... 

At the smallest scale, the silicon photonic wire waveguides that are the subject of this chapter have a silicon core only a few hundred nanometers across and refractive index of n = 3.47 at a wavelength of /. 1550 nm31. Figure 9.3 shows an example... 

Fig. 9.3 Oblique cross section view of the structure of a silicon photonic wire waveguide with a 220 nm x 450 nm core...

Fig. 9.4 The calculated TM and TE modes for X 1550 nm light propagating in the 220 nm x 450 nm photonic wire waveguide shown in Fig.9.3. The mode electric field profiles are shown as line plots along the center axis of the waveguide (indicated by the dashed lines), as well as in full cross section by gray scale contour plots...

Silicon Photonic Wire Evanescent Field Sensors... 

Figure 9.8 shows a variant of the silicon photonic wire waveguide known as a slot waveguide, which has attracted considerable recent interest43 5. The structure consists of two parallel Si channel waveguides separated by a narrow gap. Here almost the entire mode field is concentrated in the gap between the two... 

Here Ng = /Ven A(dNCff/dA) is the group effective index of the ring waveguide, a parameter that takes into account the wavelength dependence of the effective index. In the absence of dispersion Ng = Neff, but in these silicon photonic wire waveguides, Ng = 4.8 is more than twice as large as /Ven = 2.2. 

Dumon, P. Bogaerts, W. Wiaux, V. Wouters, J. Beckx, S. van Campenhout, J. Taillaert, D. Luyssaert, B. Bienstman, P. van Thourhout, D. Baets, R. Low loss SOI photonic wires and ring resonators fabricated with deep UV lithography, IEEE Photonic Technol. Lett. 2004, 16, 1328 1330... 

---