Super-lattice GaN/AlxGa1-xN nanoscale MITATT oscillator as terahertz radiation source: Novel application in breast cancer imaging
Abstract
Abstract X-ray mammography is popularly used for breast cancer screening and monitoring since past several years. However, X-Ray is considered to be an ionizing radiation that may lead to secondary cancer development. An alternative approach is the Terahertz (T-Ray) hyperthermia technique. This paper will report on an in-silico T-ray thermal imaging and detection system for breast cancer identification and screening. For this, a super-lattice (GaN/AlxGa1-xN) p++-n--n-n++ type room temperature semiconductor Terahertz source (radiation within 0.1 THz− 1.0 THz regime) was designed. A modified Quantum Corrected Non-Linear Drift-Diffusion (m-QCNLDD) numerical model is developed and used for this purpose. An equivalent circuit model is developed and analysed for obtaining impedance and admittance characteristics. The device can generate non-ionizing RF power∼6 × 1010 W.m−2 at 0.1 THz and ∼0.43 × 1010 W.m−2 at 1.0 THz. Further, the authors have verified the newly proposed numerical model by comparing the results with experimental observations. Finally, the m−QCNLDD simulator coupled with COMSOL Multi-physics® software has been used for generating microwave and T-ray thermographs of healthy and cancerous breast tissues. The authors have made a comparative study between microwave and terahertz thermographs for relative accuracy determination. The breast tumour (∼3 mm diameter) detection accuracy has been enhanced greatly in the T−ray thermograph studies. To the best of authors'…
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