Additionally, three dimensional photonic crystal waveguides of {HEAD ~ an inverted opal structure} having {TAIL ~ a photonic band gap} in all light traveling directions can be fabricated 
having
Additionally , three dimensional photonic crystal waveguides of { HEAD ~ an inverted opal structure } having { TAIL ~ a photonic band gap } in all light traveling directions can be fabricated
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH