Title :
Increased responsivity of photo-EMF detectors using asymmetric interdigitated contacts
Author :
Coy, Johannes A. ; Nolte, David D. ; Dunning, G.J. ; Pepper, D.M. ; Chiao, Mu ; Bacher, G.D. ; Klein, M.B.
Author_Institution :
Dept. of Phys., Purdue Univ., West Lafayette, IN, USA
Abstract :
Summary form only given. Laser-based ultrasound detection uses photo-induced emf. The low responsivity of all conventional photo-emf sensors has been a serious challenge because it is more than an order of magnitude less sensitive than conventional photodetectors. The photo-emf sensor responsivity is improved via a novel surface electrode pattern: an asymmetric interdigitated contact (AIDC) geometry. Our design is shown with one pair and four pairs of interdigitated surface contacts. The single pair device is the conventional transverse-field photo-emf detector design, for above-bandgap operation.
Keywords :
electric potential; electrodes; photodetectors; sensors; symmetry; ultrasonic measurement; ultrasonic transducers; above-bandgap operation; asymmetric interdigitated contact geometry; asymmetric interdigitated contacts; increased responsivity; interdigitated surface contacts; laser-based ultrasound detection; low responsivity; photo-EMF detectors; photo-emf sensor responsivity; photo-emf sensors; photo-induced; photo-induced emf; single pair device; surface electrode pattern; transverse-field photo-emf detector design; Detectors; EMP radiation effects; Electrodes; Optical distortion; Optical scattering; Optical sensors; Optical surface waves; Phase distortion; Probes; Pulse measurements;
Conference_Titel :
Lasers and Electro-Optics, 1999. CLEO '99. Summaries of Papers Presented at the Conference on
Conference_Location :
Baltimore, MD, USA
Print_ISBN :
1-55752-595-1
DOI :
10.1109/CLEO.1999.834514
