فیلتر رنگي كاهشي بازتابنده مقاوم در مقابل تغييرات زاويه تابش با استفاده از فراسطح دي‌اکسيد تيتانيوم و آينه‌هاي آلومينيومي
الموضوعات :
زهرا ناصحي
1
(دانشگاه صنعتي شيراز)
نجمه نزهت
2
(دانشگاه صنعتي شيراز)
الکلمات المفتاحية: فيلتر رنگي کاهشيدوقطبي مغناطيسيغير وابسته به قطبشغير حساس به زاويه تابش,
ملخص المقالة :
اخيراً فيلترهاي رنگي براي تصويربرداري و پرينت رنگي با کيفيت و وضوح بالا، در مقياس زير طول موج به کار مي‌روند. در اين مقاله، يک فيلتر رنگي کاهشي بازتابنده با کنتراست رنگي عالي نشان داده شده است. در فيلتر پيشنهادي، نانومکعب‌هاي دي‌اکسيد تيتانيوم با آينه‌هاي آلومينيومي در بالا و پايين نانومکعب‌ها مجتمع شده است. به دليل ايجاد دوقطبي مغناطيسي در نانومکعب‌هاي دي‌اکسيد تيتانيوم، يک تشديد در طيف مرئي اتفاق مي‌افتد که با تغيير اندازه ضلع نانومکعب‌ها، طول موج تشديد در تمام طيف مرئي تنظيم مي‌شود. پچ‌هاي آلومينيومي در دو طرف نانومکعب‌ها، باعث دستيابي به بازده بيش از 70% و پهناي باند كمتر از 35 نانومتر مي‌شوند. فيلتر پيشنهادي نسبت به زاويه تابش خيلي حساس نيست، به طوري که با افزايش زاويه تابش از 0 تا 60 درجه، طول موج تشديد تغيير بسيار ناچيزي دارد و پهناي باند و بازده يکساني را حفظ مي‌کند. به علاوه، به دليل هندسه متقارن، فيلتر پيشنهادي به قطبش موج ورودي نيز وابسته نيست. اين مزيت‌ها عملکرد فيلتر پيشنهادی را در تصويربرداري و نمايشگرهاي با روشنايي و وضوح بالا تسهيل مي‌سازد.
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