Electro-optic measurement system with high spatial resolution utilizing poled polymer film as external probe tip

✍ Scribed by Hongfei Liu; Maobin Yi; Hongbo Zhang; Alin Hou; Xiaohong Chuai; Daming Zhang

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 279 KB
• Volume: 37
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/j.optlastec.2004.06.005

✦ Synopsis

A new external electro-optic probing technology has been first demonstrated using a poling electro-optic (EO) polymer film, spincoated on 20 nm thick grounding perspective aluminum layer which sputtered on a piece of ITO glass ð1000 mm  1000 mm  80 mmÞ as a probe tip, the aluminum layer which has 30% reflectance ratio is also a reference coating. A 1 mm interdigital electrode was measured, and the spatial resolution of less than 0:5 mm was obtained. Voltage sensitivity was approximately 2 mV= ffiffiffiffiffiffi ffi Hz p . The probing beam reflected from the metal line is phase-modulated by the signal electric field in the EO polymer film, and then converted to amplitude modulation by interference with the reference beam reflected from the 30% reflective coating. The reference electrode makes sure that the most signal voltage drops down in the EO polymer film.