آشکارسازهای نانوساختارگرافنی برمبنای EIT به منظور تشخیص مواد منفجره با استفاده از امواج تراهرتز

شیری, جلیل; ملک زاده, عبدالله

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	آشکارسازهای نانوساختارگرافنی برمبنای EIT به منظور تشخیص مواد منفجره با استفاده از امواج تراهرتز
الکترومغناطیس کاربردی
مقاله 6، دوره 6، شماره 1 - شماره پیاپی 16، مرداد 1397، صفحه 41-48 اصل مقاله (1.26 M)
نوع مقاله: مقاله پژوهشی
نویسندگان
جلیل شیری؛ عبدالله ملک زاده^*
دانشگاه جامع امام حسین (ع)
تاریخ دریافت: 28 مهر 1397، تاریخ بازنگری: 18 اسفند 1397، تاریخ پذیرش: 19 اسفند 1397
چکیده
مواد مختلف طیف جذبی مختلفی نسبت به امواج تراهرتز دارند. بنابراین با آشکارسازی طیف جذبی امواج تراهرتز از مواد مختلف می‌توان نوع ماده را تشخیص داد. یکی از راه‌های بسیار مؤثر در آشکارسازی طیف امواج تراهرتز به‌منظور تشخیص مواد مختلف استفاده از پدیدهی شفافیت القایی الکترومغناطیسی (EIT) در یک نانوساختار گرافنی تحت میدان مغناطیسی میباشد. در این مقاله آشکارسازی امواج تراهرتز به‌وسیله‌ی نانوساختار گرافن واقع در هستهی آشکارساز از یک روش تمام اپتیکی موردبررسی قرارگرفته است. در این طرح به‌منظور تشخیص امواج تراهرتز به‌طور عمده اندازه‌گیری رفتار طیف عبوری نور کاوشگر ضعیف از نانوساختار گرافنی که باوجود و عدم وجود طیف مشخصی از امواج تراهرتز مرتبط است صورت میگیرد. گذارهای اپتیکی فرکانسی بین سطوح انرژی موجود در گرافن توسط میدان مغناطیسی خارجی قابل تنظیم میباشد که برای آشکارسازی امواج تراهرتز در محدودهی طیفی موردنظر مورداستفاده قرار میگیرد. این ویژگی باعث میشود که آشکارسازی انواع مواد منفجره با طیف‌های جذبی مختلف نسبت به امواج تراهرتز به‌طور تمام اپتیکی موردبررسی قرار گیرد. ازجمله مواد منفجره مانند RDX، PETN و آمونیوم نیترات دارای طیف جذبی در محدودهای از امواج تراهرتز میباشند که به‌طور وسیع در انواع مواد منفجره مورداستفاده قرارگرفته است و با این روش قابل‌شناسایی و آشکارسازی میباشند. پارامترهایی نظیر شدت امواج تراهرتز و فاز نسبی میدانها و اثرات آن بر روی جذب و پاشندگی، همچنین با اندازه‌گیری زمان سوئیچ زنی سرعت گروه نور کاوشگر، حساسیت و پاسخ سریع آشکارساز به نوسانات امواج تراهرتز موردبررسی قرارگرفته و پاسخ آشکارساز را بین 5 الی 8 پیکوثانیه که زمان بسیار کوتاهی میباشد تخمین زده شده است.
کلیدواژه‌ها
آشکارسازی مواد منفجره؛ امواج تراهرتز؛ پاشندگی و جذب؛ سوئیچ‌ تمام اپتیکی؛ EIT؛ نانو ساختار گرافن
عنوان مقاله [English]
EIT-based nanostructure detectors for detecting materials using terahertz waves
نویسندگان [English]
jalil shiri؛ Abdollah Malekzadeh
Imam Hossein Comprehensive University
چکیده [English]
Different materials have different absorption spectra of the terahertz (THz) radiation. So, by detecting the absorption spectra of THz radiation of different materials we can assess material substances. We propose and analyze an efficient way to detect the THz radiation in a magnetized graphene system via electromagnetically induced transparency (EIT). In this paper an all-optical method for THz signal detection in graphene nanostructure in core of a detector is investigated. Such a scheme for THz signal detection mainly relies on the measurement of probe transmission spectra, in which the behaviors of a weak-probe transmission spectrum can be controlled by switching on/off the THz signal radiation. Taking into account the tunable optical transition frequency between the Landau levels in graphene, our analytical results demonstrate that a broad frequency bandwidth of the THz signal radiation can be inspected and modulated by means of an external magnetic field. This feature being useful for detection of explosives with width absorption spectra of the optical terahertz signal. Common explosives such as RDX, TEND and Ammonium Nitrate in the spectral range of THz signal are widely used in a variety of explosives. Effects of parameters such as intensity of the terahertz radiation and relative phase between the fields on the absorption anddispersion of probe field hase been studied. Also, Detector sensitivity and rapid response to fluctuations of terahertz radiation by measuring the switching time of group velocity of probe field from subluminal to superluminal and vice versa hase been studied. The estimated range of the switching time is between 5 ps to 8 ps for subluminal to superluminal light propagation.Such all optical detectors can be well used in a wide range of THz spectroscopy for (explosive or forbidden) material detection.
کلیدواژه‌ها [English]
All-optical switching, Detection, Dispersion and absorption, Electromagnetically induced transparency, Graphene nanostructure, Terahertz signals

مراجع
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آشکارسازهای نانوساختارگرافنی برمبنای EIT به منظور تشخیص مواد منفجره با استفاده از امواج تراهرتز