Summary of Science materials doctoral thesis: Design and investigation of 1D, 2D photonic crystals for bistable devices

The dissertation targets the basic research on the physical models and new structures; calculating and simulating the bistable devices using 1D, 2D PhC structures. The effects of the PhC configuration and structural parameters on the optical characteristics and working performance of bistable devices will be investigated.
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Summary of Science materials doctoral thesis: Design and investigation of 1D, 2D photonic crystals for bistable devices MINISTRY OF EDUCATION VIETNAM ACADEMY AND TRAINING OF SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY  HOANG THU TRANG DESIGN AND INVESTIGATION OF 1D, 2D PHOTONIC CRYSTALS FOR BISTABLE DEVICES Specialized: Materials for Optics Optoelectronics and Photonics Numerical code: 9 44 01 27 SUMMARY OF SCIENCE MATERIALS DOCTORAL THESIS Hanoi - 2020 The thesis was completed at Key Laboratory for Electronic Materials and Devices, Institute of Materials Science, Vietnam Academy of Science and Technology. Supervisors: 1. Assocc. Prof. Dr. Ngo Quang Minh 2. Prof. Dr. Arnan Mitchell Reviewer 1: Reviewer 2: Reviewer 3: The dissertation will be defended at Graduate University of Science and Technology, 18 Hoang Quoc Viet street, Hanoi. Time:...........,............., 2020 The thesis could be found at: - National Library of Vietnam - Library of Graduate University of Science and Technology - Library of Institute of Science Materials 9. INTRODUCTION 1. The urgency of the thesis Micro- and nano-structured photonic and optoelectronic devices have been the great interests for their outstanding applications and features in integrated micro-optoelectronic circuits with high processing speed. Their unique properties have been expected to realize the new generation of opto-electronic components with high efficiency, low cost, and low energy consumption... [1-5]. There are two main approaches to improve the efficiency, functionality and reduce the cost of photonic and opto-electronic devices: (i) firstly of using new structures for the core elements that build up the devices; (ii) the other approach is the use of advanced materials with many special features. Within the framework of my Ph.D. thesis in materials science, speciality in optical materials, opto-electronics and photonics, I will study in depth and present the use of new structures for photonic materials and devices which have not been available in nature, for applications in telecommunication and optical processing. Photonics was appeared in the 80s of the XIX century [6] and developed very actively in the XX century, especially since the discovery of a new material with artificial structures such as photonic crystals (PhCs), plasmonics and metameterials (MMs) [7-9]. The PhC structure is the periodicity of elements with different dielectric constants. The periodic of the refractive indices of the dielectric materials enables the PhC structure can manupulate the light without loss. The light/electromagnetic waves transmitted inside the PhC structure interact with the periodic of the dielectric elements and create the photonic bandgap (PBG). Light/electromagnetic waves with frequencies (or wavelengths) in the PBG region cannot pass through the PhC structure. Besides, we can easily capture, control, and direct lights in the identical media as desired. Light/electromagnetic wave propagation can be made in the PBG region by creating the cavities or waveguides in the PhC structure. The cavity and the waveguide are the key elements that build up the integrated optical and opto- electronic components such as switches and optical processing that the thesis will mention. PhC structures have been studied and developed widely around the world, particular the research group of Professor J.D. Joannopoulos at Massachusetts Institute of Technology (USA) [10,11]. The group's key research members come from different departments such as Physics, Materials Science, Electronics and Computer Engineering, Mathematics... Every year, many excellent publications are published in high impact journals such as Science, Nature, Physical Review Letters ... Many computational softwares have been known widely such as MIT Photonic-Bands (MPB), MIT Electromagnetic Equation Propagation (MEEP) [10,11]. In Vietnam, the research on photonic and opto-electronic devices using PhC structure is a new topic that has been attracting much attention from researchers at institutes and universities: research group at Institute of Materials Science and Institute of Physics which belong to Vietnam Academy of Science and Technology (VAST), Hanoi University of Science and Technology...[14]. At the Institute of Materials Science, the research teams of Assoc. Prof. Pham Van Hoi and Assoc. Prof. Pham Thu Nga have successfully fabricated 1D and 3D PhC structures [15-17], based on porous silicon and silica, used for the liquid sensors. In addition, my research group at Institute of Materials Science developed the computation, simulation of some micro and nano-photonic devices using 1D and 2D PhC structures, such as the micro-resonantors, surface plasmon resonance structures toward for optical communication, switching, and optical processing... Some achived results were published in the high impact journals [18- 21]. Two methods have been used to calculate and simulate the 1D and 2D PhC stuctures: (i) Finite-difference time-domain method (FDTD) and (ii) Plane wave expansion method (PWE). These are modern methods with high accuracy that allow solving the specific problems using Maxwell's equations in time and frequency domains. These were embedded in two highly reliable, free open-source softwares, which called MEEP and MPB, developed by Massachusetts Institute of Technology (USA). MEEP and MPB were installed in high-performance parallel computing systems of our Lab. The results of calculation and simulation confirm the correction and accuracy of the theoretical model. Based on the good results obtained in recent years including ...