Enhancement of modulation depth of an all-optical switch using an azo dye-ethyl red film

doi:10.1088/1674-1056/19/8/084208

Abstract The polymethyl methacrylate (PMMA) film doped with an azo dye ethyl-red (ER) film is employed to demonstrate the properties of an all-optical switch by its photoinduced dichroism and birefringence. We show how to enhance remarkably the modulation depth of all-optical switches almost to 100% by using two linear polarization beams: one beam is inclined at 45$^\circ$ with respect to the probing beam and serves as a pumping beam, and the other beam is perpendicular to the probing beam and used as an erasing beam. Furthermore, a maximum-to-minimum output intensity ratio of 2000:1 is achieved in experiment, which is very useful and important for optical storages and image displays.

Keywords: all-optical switch azo dye ethyl-red modulation depth

Received: 02 November 2009
Revised: 30 January 2010
Accepted manuscript online:

PACS:	42.79.Ta	(Optical computers, logic elements, interconnects, switches; neural networks)
	42.60.Fc	(Modulation, tuning, and mode locking)
	42.79.Kr	(Display devices, liquid-crystal devices)
	42.79.Vb	(Optical storage systems, optical disks)
	78.20.Fm	(Birefringence)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10774152), the Science and Technology Foundation of Guangzhou City, China (Grant No. 2008J1-C021), and the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20070055103).

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Lu Wen-Qiang(陆文强), Chen Gui-Ying(陈桂英), Hao Zhao-Feng(郝召锋), Xu Jing-Jun(许京军),Tian Jian-Guo(田建国), and Zhang Chun-Ping(张春平) Enhancement of modulation depth of an all-optical switch using an azo dye-ethyl red film 2010 Chin. Phys. B 19 084208

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Enhancement of modulation depth of an all-optical switch using an azo dye-ethyl red film

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