Light control substance and light control method using the same

Active solid-state devices (e.g. – transistors – solid-state diode – Thin active physical layer which is – Heterojunction

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257 21, 257 22, 257 82, 257 85, 257101, 257102, 257184, 372 44, 372 45, 359248, H01L 2906, H01L 310328, H01L 310336, H01L 3300

Patent

active

057420726

ABSTRACT:
A light control substance having a negative input-output characteristic is used to invert optical signals. The light control substance is an absorbing substance and has a multi-level energy structure such that ground state absorption occurs between a ground level and a level higher than the ground level and excited state absorption occurs between an excited level and a level higher than the excited level. At a specific wavelength, a variation .DELTA.Iout in the intensity of output light and a variation .DELTA.Iin in the intensity of input light satisfy the following equations:

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