| Even before the breakthroughs that made long-distance fiber optics practical, aerospace engineers were trying to use photonic systems. |
| The same issues apply more generally to other photonic crystal systems in non-fiber geometries. |
| At the heart of this approach are the photonic wavepackets that exhibit well-defined photon number and modal character. |
| A decade later, researchers were able to fabricate photonic crystals that work in the near-infrared and visible regions of the spectrum. |
| Such QD devices can be integrated into the photonic crystals that will be used as active optical router circuits. |
| Laser or photonic engines, because they might be propelled by laser beams inflating a gigantic sail, may have even larger specific impulses. |
