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雙層局部非對稱光柵的偏振無關寬帶反射
Polarization-Independent Broadband Reflection with Two-Layer Locally Asymmetric Grating
投稿時間:2019-03-25  修訂日期:2019-03-25
DOI:
中文關鍵詞: 亞波長光柵  寬帶反射器  泄漏模共振
英文關鍵詞: Subwavelength grating  Broadband reflector  Leakage mode resonance
基金項目:國家自然科學(11504435),中南民族大學中央高?;究蒲匈M項目(CZY18001),國家留學基金委項目(201807780001)
作者單位E-mail
侯金 中南民族大學 電子信息工程學院 houjin@mail.scuec.edu.cn 
楊濱賢 中南民族大學 電子信息工程學院  
楊春勇 中南民族大學 電子信息工程學院  
陳少平 中南民族大學 電子信息工程學院  
摘要點擊次數: 170
全文下載次數: 0
中文摘要:
      為了滿足光通信與傳感系統發展對光反射器的偏振和帶寬的性能要求,將局部非對稱光柵與正交串聯反射排布方式相結合,實現了具有超寬反射帶寬的偏振無關反射。首先,基于局部非對稱結構,在TM模式下使得光柵的四個泄露模式能夠分布在更寬的光譜上,從而實現了反射率大于98%的寬達469納米的單偏振超寬帶反射。其次,利用正交串聯排布方式90°的旋轉對稱性,設計形成雙層光柵反射,在反射率大于97%時獲得了492納米的偏振無關寬帶反射。最后,對串聯光柵之間的間距進行了探討,結果表明:非對稱串聯光柵不僅在大間距和特定的小間距下能夠實現寬譜偏振無關的反射,考慮間距的改變,還可應用于光濾波器和光傳感器等方面。
英文摘要:
      In order to meet the demands of both polarization and bandwidth performance of the reflectors in optical communication and sensing systems, polarization-independent reflection with ultra-wide bandwidth is obtained by combining local asymmetric grating with orthogonal series arrangement. Firstly, based on the local asymmetric structure, the four leakage modes of the grating could be distributed over a wide spectrum in TM mode, which makes the local asymmetric grating have an ultra-wideband reflection of 469 nm with reflectivity greater than 98%. Secondly, making use of the 90-degree rotational symmetry in orthogonal series arrangement, the polarization-independent broadband reflection of 492 nm with reflectivity greater than 97 % is obtained with an optimized bi-layer grating system. Finally, the spacing distance between the two series connection gratings are studied. It shows that asymmetric series gratings not only can achieve wide-spectrum polarization-independent reflection with both large spacing and specific small spacing distances, they also can be applied to optical filters and optical sensors when changing the spacing distances.
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