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

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشگاه جامع امام حسین (ع)

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


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
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