کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1543324 997497 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Polarization-independent unidirectional light transmission by an annular photonic crystal prism
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Polarization-independent unidirectional light transmission by an annular photonic crystal prism
چکیده انگلیسی


• Annular photonic crystal prism for unidirectional transmission in both polarizations.
• Anti-reflection coating layer to enhance transmittances up to 44%.
• Contrast ratio as high as 0.96 at 1.55 μm for the TE and TM polarizations.
• Efficient operation between 1.50 μm and 1.60 μm.
• Unidirectionality is preserved for the angle of incidence between −5° and +5°.

Unidirectional transmission of light irrespective of its polarization by a two-dimensional annular photonic crystal in the form of a right prism is numerically demonstrated. Band structure of the crystal obtained through the plane-wave expansion method reveals a directional band gap along a principal axis, leading to prohibition of wave transmission in the reverse direction. In the forward direction, however, transmission of waves is facilitated by circumventing the directional band gap due to altered surface orientation. Polarization-independent unidirectional light transmission is demonstrated through finite-difference time-domain simulations. Unidirectional operation is enhanced and the polarization independence is established through the introduction of an anti-reflection coating layer, which increases the forward transmittances for both polarizations up to 0.44, such that a contrast ratio of 0.96 is attained at a free-space wavelength of 1.55 μm. Although polarization independence deteriorates, unidirectionality is preserved between 1.45 μm and 1.60 μm, provided that the angle of incidence remains between −5° and +5°. Device performance is also influenced by the transverse source size, where leakage in the reverse direction may be suffered if the source width is beyond a critical value.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Photonics and Nanostructures - Fundamentals and Applications - Volume 11, Issue 3, August 2013, Pages 270–278
نویسندگان
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