electro-optical
adjective
elec·tro-op·ti·cal i-ˌlek-trō-ˈäp-ti-kəl 
variants or electro-optic
i-ˌlek-trō-ˈäp-tik
1
: of or relating to electro-optics
2
a
: relating to or being a change in the refractive index of a material due to an electric field
electro-optical effect
b
: using or being a material that exhibits electro-optical properties
an electro-optical crystal
3
: relating to or being an electronic device for emitting, modulating, transmitting, or sensing light
electro-optically
i-ˌlek-trō-ˈäp-ti-k(ə-)lē
adverb 
Word History
First Known Use
1850, in the meaning defined at sense 1