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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 31 — Nov. 1, 2013
  • pp: 7524–7529

Electric-induced oxide breakdown of a charge-coupled device under femtosecond laser irradiation

Liuzheng Gao, Zhiwu Zhu, Zhengzheng Shao, Xiang’ai Cheng, and Shengli Chang  »View Author Affiliations

Applied Optics, Vol. 52, Issue 31, pp. 7524-7529 (2013)

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A femtosecond laser provides an ideal source to investigate the laser-induced damage of a charge-coupled device (CCD) owing to its thermal-free and localized damage properties. For conventional damage mechanisms in the nanosecond laser regime, a leakage current and degradation of a point spread function or modulation transfer function of the CCD are caused by the thermal damages to the oxide and adjacent electrodes. However, the damage mechanisms are quite different for a femtosecond laser. In this paper, an area CCD was subjected to Ti: sapphire laser irradiation at 800 nm by 100 fs single pulses. Electric-induced oxide breakdown is considered to be the primary mechanism to cause a leakage current, and the injured oxide is between the gate and source in the metal-oxide semiconductor field-effect transistor (MOSFET) structure for one CCD pixel. Optical microscopy and scanning electron microscopy are used to investigate the damaged areas and the results show that the electrodes and the oxide underneath are not directly affected by the femtosecond laser, which helps to get rid of the conventional damage mechanisms. For the primary damage mechanism, direct damage by hot carriers, anode hole injection, and an enlarged electric field in the insulating layer are three possible ways to cause oxide breakdown. The leakage current is proved by the decrease of the resistance of electrodes to the substrate. The output saturated images and the dynamics of an area CCD indicate that the leakage current is from an electrode to a light sensing area (or gate to source for a MOSFET), which proves the oxide breakdown mechanism.

© 2013 Optical Society of America

OCIS Codes
(040.1520) Detectors : CCD, charge-coupled device
(140.3330) Lasers and laser optics : Laser damage
(140.3538) Lasers and laser optics : Lasers, pulsed

ToC Category:
Lasers and Laser Optics

Original Manuscript: September 12, 2013
Revised Manuscript: October 13, 2013
Manuscript Accepted: October 14, 2013
Published: October 25, 2013

Liuzheng Gao, Zhiwu Zhu, Zhengzheng Shao, Xiang’ai Cheng, and Shengli Chang, "Electric-induced oxide breakdown of a charge-coupled device under femtosecond laser irradiation," Appl. Opt. 52, 7524-7529 (2013)

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