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