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