طراحی و شبیه‌سازی یک نانو لحسگر پاسمونیکی به‌منظور اندازه‌گیری چگالی ابر اتم‌های سرد شده روبیدیوم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد،دانشگاه جامع امام حسین (ع) ، تهران، ایران

2 استادیار، دانشگاه جامع امام حسین (ع)، تهران، ایران

چکیده

در این مقاله یک حسگر پلاسمونی جدید برای اندازه‌گیری چگالی ابر اتم‌های سرد شده روبیدیوم 87 پیشنهاد و به کمک ماتریس چگالی مربوط به یک سیستم کوانتومی دو ترازه و روش تفاضل محدود در حوزه زمان (FDTD) شبیه­سازی و تحلیل‌شده است. این حسگر، چگالی ابر اتمی را از طریق تغییرات حاصل‌شده در نور انعکاسی ساختار تشخیص می­دهد، چراکه ضریب شکست محیط گازی با تغییر در چگالی آن تغییر می‌یابد. ساختار بهینه پیشنهادی متشکل از فلز طلا (باضخامت )- اکسید قلع ایندیوم (باضخامت )–MgF2 (باضخامت ) و محیط اتمی متشکل از ابر اتمی سرد شده روبیدیوم 87 است. مشاهده شد که لایه اکسید فلزی قلع ایندیوم نقش مهمی در پارامترهای حسگر خواهد داشت. با بهینه­سازی ضخامت­ این لایه و همچنین انتخاب ترتیب چینش مناسب بین لایه‌ها، حساسیت زاویه‌ای و فاکتور شایستگی بیشینه به ترتیب برابر با   و  برای ساختار GGIMA به دست آمد. ساختار پیشنهادی قادر است پنجره جدیدی برای آشکارسازی و مشخصه یابی ابر اتم‌های سرد شده فلزات قلیایی که در زمینه‌های مختلف مربوط به فناوری‌های کوانتومی نظیر ساعت‌های اتمی سرد، گیرنده‌های کوانتومی امواج RF مبتنی بر اتم‌های سرد و همچنین سیستم‌های ناوبری مبتنی بر اتم‌های سرد باز کند.

کلیدواژه‌ها


عنوان مقاله [English]

Design and Simulation of a New Plasmonic Nano-Sensor to Measure the 87Rb Cooled Atomic Density

نویسندگان [English]

  • Reza Afshar 1
  • yadollah shahamat 2
1 Master's degree, Imam Hussein (AS) University, Tehran, Iran
2 Assistant Professor, Imam Hossein (AS) University, Tehran, Iran
چکیده [English]

In this paper a novel plasmonic sensor for measuring the density of cold 87Rb atoms is proposed that it is analyzed and simulated using the Density matrix and FDTD method. The sensor detects the density of cold 87Rb atoms by changes in the reflectance of the structure. The mechanism of this sensor is based on the variation of refractive index with the atomic density. The proposed structure consists of metal gold (with thickness 35nm)-indium tin oxide (with thickness 220 nm) - MgF2 (with thickness 5 nm) and cold 87Rb atomic medium. The results showed that the indium tin oxide metal oxide layer plays an important role in the sensor parameters. By optimizing the thicknesses of the metal oxide and choosing the arrangement layers, the maximum sensitivity and Figure of merit of and  for the GGIMA structure can be achieved, respectively. The structure proposed is able to open a new window for cooled atoms of alkali metals detection and characterization which are useful for quantum technology such as cold atomic clocks, quantum RF receivers based on cold atoms and quantum navigation systems.

کلیدواژه‌ها [English]

  • Quantum
  • Cold 87Rb atoms
  • Plasmonic

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دوره 13، شماره 1 - شماره پیاپی 30
بهار و تابستان
شهریور 1404
صفحه 13-25
  • تاریخ دریافت: 22 بهمن 1403
  • تاریخ بازنگری: 07 فروردین 1404
  • تاریخ پذیرش: 14 اردیبهشت 1404
  • تاریخ انتشار: 31 اردیبهشت 1404