فیلتر رنگي كاهشي بازتابنده مقاوم در مقابل تغييرات زاويه تابش با استفاده از فراسطح دي‌اکسيد تيتانيوم و آينه‌هاي آلومينيومي
محورهای موضوعی : مهندسی برق و کامپیوتر
زهرا ناصحي
1
(دانشگاه صنعتي شيراز)
نجمه نزهت
2
(دانشگاه صنعتي شيراز)
کلید واژه: فيلتر رنگي کاهشيدوقطبي مغناطيسيغير وابسته به قطبشغير حساس به زاويه تابش,
چکیده مقاله :
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.
Recently, color filters have been used for high quality resolution color imaging and printing in subwavelength scale. In this paper, a reflective subtractive color filter with excellent color contrast has been demonstrated. In the proposed filter, titanium dioxide nanocuboids have been integrated with aluminum mirrors at the top and bottom of them. Due to the creation of magnetic dipole in titanium dioxide nanocuboids, a resonance occurs in the visible spectrum, which the resonance wavelength could be tuned over the whole visible range through the adjustment of the nanocuboid side size. By utilizing aluminum patches on both sides of the nanocuboids, the efficiency of more than 70% and the bandwidth of less than 35 nm have been attained. The proposed filter exhibits high incident angular tolerance such that by increasing the incident light angle from 0 to 60 degree, the resonance wavelength has very poor variation and maintains the same bandwidth and efficiency. Also, the proposed filter is polarization-independent due to its symmetric geometry. These advantages facilitate the function of the suggested filter in imaging and displays with high brightness.
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