The optical element, includes a first voltage application electrode 13, a first opposing electrode 17 arranged in opposition to the first voltage application electrode 13, and {HEAD ~ a first phase} changing {TAIL ~ layer} 15 arranged between the first voltage application electrode 13 and the first opposing electrode 17 
changing
The optical element , includes a first voltage application electrode 13 , a first opposing electrode 17 arranged in opposition to the first voltage application electrode 13 , and { HEAD ~ a first phase } changing { TAIL ~ layer } 15 arranged between the first voltage application electrode 13 and the first opposing electrode 17
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH