Saved Bookmarks
| 1. |
2πc/15a) 24 b) 12c) 18d) 36 |
|
Answer» -STEP explanation:An anomalous dispersion for modes of a MATERIAL resonator is highly desired to form frequency combs. A resonator free-spectral-range (FSR) controlled by SHAPE so as to increase with frequency ω/2π compensates the normal index dispersion ∂n/∂ω > 0, producing evenly SPACED resonances. Only special shapes achieve this scope. We show here that broad periodic corrugated waveguides working at Littrow regime feature such an increasing trend ∂FSR/∂ω > 0. We outline experimentally this trend on silicon-on-insulator devices designed for 45° Littrow operation. We predict dispersion-free silicon-based designs ACROSS the 1.4–4.0 μm mid-infrared range. |
|