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