title: Electro-absorption modulator with an asymmetric coupled triple quantum well for low-voltage operation.
abstract: We present an electro-absorption modulator based on the enhanced electro-optic effect of an asymmetric coupled triple quantum well (ACTQW) to achieve a large transmittance difference at a low driving voltage for high-definition (HD) three-dimensional (3D) imaging applications. Our numerical calculations show that an ACTQW structure can provide a significantly lower-voltage operation without degrading the absorption coefficient change at the operating wavelength of 850 nm. The fabricated electro-absorption modulator (EAM) based on an ACTQW shows that the operating voltage can be reduced by nearly 50% compared with an EAM based on a conventional rectangular quantum well while also achieving a large transmittance difference in excess of 50%, which is in good agreement with the numerical calculation results. These results suggest that using an EAM with an ACTQW is a promising approach for the realization of a high-resolution 3D imaging system.
authors.forename: Byung Hoon
authors.initials: BH
authors.lastname: Na
authors.forename: Gun Wu
authors.initials: GW
authors.lastname: Ju
authors.forename: Chang Young
authors.initials: CY
authors.lastname: Park
authors.forename: Soo Kyung
authors.initials: SK
authors.lastname: Lee
authors.forename: Hee Ju
authors.initials: HJ
authors.lastname: Choi
authors.forename: Yong Chul
authors.initials: YC
authors.lastname: Cho
authors.forename: Yong Hwa
authors.initials: YH
authors.lastname: Park
authors.forename: Yong Tak
authors.initials: YT
authors.lastname: Lee