کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7130894 1461644 2013 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optical efficiency enhancement methods for terahertz receiving photoconductive switches
ترجمه فارسی عنوان
روشهای افزایش بهره وری نوری برای سوئیچهای فوتوکاتریتور تراهرتز
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
چکیده انگلیسی
We improve the efficiency of THz receiving photoconductive switches by improving the conversion of the optical pump to signal current. This is achieved by both optimizing the incident excitation beam polarization and spatial profile of excitation. Due to boundary conditions of the electric field at the electrode edge, a nanometer-sized polarization-dependent shadow is created in the substrate at the electrode edge where most picosecond lifetime photocarriers are collected. This edge effect is further harnessed by elongating the excitation beam next to the stripline electrode. The effects of excitation beam polarization and spatial profile were experimented with InGaAs/InAlAs quantum-well-based photoconductive switch. In both cases notable enhancement in the signal is observed-30% with polarization optimization and up to 100% with beam elongation. Both techniques preserve the pulse quality and are applicable with readily available optical elements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics & Laser Technology - Volume 54, 30 December 2013, Pages 297-302
نویسندگان
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