Effect of intrinsic optical feedback on the intersubband optical properties of spherical quantum dots |
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| Affiliation: | 1. Air-Nautical Research Center, Shiraz 75914, Iran;2. Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Fars 73715-181, Iran;1. Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran;2. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;1. Department of Semiconductors, Materials and Energy Research Center, P.O. Box 31787-316, Karaj, Iran;2. Department of Physics, College of Science, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran;3. Department of Chemistry, Tuyserkan Branch, Islamic Azad University, Tuyserkan, Iran;1. Department of Mathematics, Capital University of Science and Technology, Islamabad 44000, Pakistan;2. Department of Electrical Engineering, Bahria University, Islamabad 44000, Pakistan;3. Department of Mathematical Sciences, UAE University, Al Ain, P.O. Box 15551, United Arab Emirates;1. Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran;2. Nano Structured Coatings Institute of Yazd Payame Noor University, 89431-74559 Yazd, Iran;3. Department of Engineering Physics, Ankara University, 06100 Tandogan, Ankara, Turkey;4. Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525AJ Nijmegen, The Netherlands;1. School of Physics Science and Engineering, Tongji University, Shanghai 200092, China;2. Institute of Physics, Jilin Normal University, Siping 136000, China |
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| Abstract: | Optical feedback due to mutual relation between local field effect and intersubband transition in quantum dots is investigated for the first time. In this regard, dielectric function of quantum dots is considered up to the third order of nonlinearity. It is found that near the resonance, the intensity inside the dot is a function of frequency, which is determined by the optical feedback. This effect changes the magnitude of optical nonlinearity and its symmetry around the transition energy. The results indicate that the magnitude of the dielectric function decreases at frequencies below the transition frequency because of concentration of electric field inside the dot and vice versa. It is also shown that this effect is enhanced by increasing the intensity and resonance contribution in the dielectric function. |
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| Keywords: | Quantum dot Nonlinear optic Intrinsic optical feedback Density matrix approach |
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