By changing {HEAD ~ a voltage} between the first voltage application electrode 13 and {TAIL ~ the first opposing electrode} 17, a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer 15 
By changing { HEAD ~ a voltage } between the first voltage application electrode 13 and { TAIL ~ the first opposing electrode } 17 , a phase that converts plane waves into spherical waves is imparted on light that is incident on the first phase changing layer 15
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL 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