کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1542345 996717 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Observation of negative group delays within a coaxial photonic crystal using an impulse response method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Observation of negative group delays within a coaxial photonic crystal using an impulse response method
چکیده انگلیسی

An impulse response experiment is described which independently verifies the recently observed result of negative group delayed propagation within a coaxial photonic crystal. This result was unexpected when it was reported and has been the subject of enduring controversy because theoretical models predict that negative group delays should not be possible in passive linear media. The impulse response method allows for the determination of both the transmission amplitude and the group delay for narrow-band wave packets over a wide frequency range in one simple experiment. The impulse response results presented here confirm our earlier finding of negative group delays within the band gap region and are in excellent agreement with the more traditional approach of measuring transit times for wave packets. However, negative group delays are observed only over very narrow frequency ranges within the wider band gap suggesting that another interference mechanism is involved.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics Communications - Volume 273, Issue 1, 1 May 2007, Pages 32–36
نویسندگان
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