Low-voltage organic electro-optic modulators using transparent conducting oxides as electrodes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journalNot applicable

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Author(s)

  • Guoyang Xu
  • Jing Ma
  • Zhifu Liu
  • Boyang Liu
  • Seng-Tiong Ho
  • Peiwang Zhu
  • Lian Wang
  • Yu Yang
  • Tobin J. Marks
  • Neil Tucker

Detail(s)

Original languageEnglish
Article number59350Y
Pages (from-to)1-9
Journal / PublicationProceedings of SPIE - The International Society for Optical Engineering
Volume5935
Publication statusPublished - 18 Aug 2005
Externally publishedYes

Conference

TitleLinear and Nonlinear Optics of Organic Materials V
PlaceUnited States
CitySan Diego, CA
Period2 - 4 August 2005

Abstract

In this paper, we present a novel device structure for organic electro-optic modulators using transparent conducting oxides (TCOs) as electrodes to substantially reduce the switching voltage, and describe their fabrication. We report two different types of device geometry, a top conducting and a side conducting geometry, and discuss their strengths and weaknesses. We discuss how the voltage and speed performance of such modulators are dependant on the conductivity/optical loss ratio of the TCO electrodes. Our device simulation shows that by appropriately engineering the high TCO conductivity/optical loss ratio, 4-6x lower switching voltage can be achieved while still maintaining high modulation frequencies and low optical loss. We show that certain new TCO materials are capable of achieving the high conductivity/optical loss required for efficient modulation in the 1300-1550 nm wavelength range. We summarize the optical loss characteristics at 1300 nm of different types of thin-film TCO materials grown using different deposition techniques. TCO electrodes based on different types of materials, such as In2O3, ZnO, and ITO have been investigated for our device structures. Fabrication issues associated with the deposition of TCO electrodes directly on organic EO materials and our approach to addressing them are discussed. Initial results for organic EO modulators fabricated with TCOs as electrodes are presented, and the performance of these modulators are compared with theoretical modeling results. The new device structures presented here will enable next generation low-voltage organic EO modulators targeting RF photonics applications.

Research Area(s)

  • Electro-optic (EO) material, EO modulator, Poled polymer, Transparent Conducting Oxide

Citation Format(s)

Low-voltage organic electro-optic modulators using transparent conducting oxides as electrodes. / Xu, Guoyang; Ma, Jing; Liu, Zhifu; Liu, Boyang; Ho, Seng-Tiong; Zhu, Peiwang; Wang, Lian; Yang, Yu; Marks, Tobin J.; Luo, Jingdong; Tucker, Neil; Jen, Alex K.-Y.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 5935, 59350Y, 18.08.2005, p. 1-9.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journalNot applicable