Summary of Science materials doctoral thesis: Investigation of lasing emission effect and optical amplification in the cavity conjuncted with 1D, 2D photonic crystal structures

The objectives of the thesis: Research, fabricate Er3+-doped silica glass microspheres with different sizes by arc discharge method; building an experimental system to investigate WGM mode laser emission spectrum in the optical communication wavelength region ~ 1550 nm of some fabricated microspheres.
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Summary of Science materials doctoral thesis: Investigation of lasing emission effect and optical amplification in the cavity conjuncted with 1D, 2D photonic crystal structures MINISTRY OF EDUCATION VIETNAM ACADEMY AND TRAINING OF SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY ----------------------------------- Nguyen Van An INVESTIGATION OF LASING EMISSION EFFECT AND OPTICAL AMPLIFICATION IN THE CAVITY CONJUNCTED WITH 1D, 2D PHOTONIC CRYSTAL STRUCTURES Major: Materials for Optics Optoelectronics and Photonics Code: 9 44 01 27 SUMMARY OF SCIENCE MATERIALS DOCTORAL THESIS Hanoi – 2020 The thesis was completed at: Graduate University of Science and Technology - Vietnam Academy of Science and Technology. Supervisor 1: Assoc. Prof. Dr. Ngo Quang Minh Supervisor 2: Assoc. Prof. Dr. Pham Van Hoi Reviewer 1: … Reviewer 2: … Reviewer 3: …. The thesis will be defended at Graduate University of Science and Technology - Vietnam Academy of Science and Technology at ……, …..........., 202…. The thesis could be found at: - Library of Graduate University of Science and Technology - National Library of Vietnam 1 INTRODUCTION 1. The urgency of the thesis The transmission of electromagnetic waves inside 1D-PhC was first studied by Lord Rayleigh in 1887. In 1987, the research works about 3D-PhC related to effect of the random emission prohibition in PhC due to existence of PBG was published and proposed by E. Yablonovitch and S. John [1,2]. From that, PhC has attracted the special attention of the researchers in the field of using the new structures based on PhC to conduct, transmit and control electromagnetic waves as well as use electromagnetic waves to information processing. The 2D-PhC controlled waveguide properties, convergence on 2D surface and 1D-PhC fibers for single mode lasers with high output power weve proposed by Birks in 1997 [3]. Until 1999, after O. Painter’s team succeeded in fabricating 2D- PhC lasers with directional feedback distribution effects in the 2D- PhC lattice structure [4], lasers based on photonic materials have been promoted in research in photonic laboratories around the world. The PhC’s cavities with different quasiperiodic lattices have been studied by many groups by theoretical calculation, simulation and experiment to fabricate them [5,6]. The 3D-PhC structure can control the waveguide in 3D space, therefore it has great applicability in micro-optical integrated circuits and ultra-low emission threshold laser, the first 3D-PhC was fabricated by E. Yablonovitch in 1991 based on diamond nanoparticles distributed in organic glass lattice [7]. The micro-resonant cavities with Whispering-Gallery-Mode (WGM) give a (Q) high quality factor and small mode volume so they have been used to decrease the laser emission threshold and other nonlinear optical effects [8-10]. In addition, the micro-resonant 2 cavities with WGM have also been widely used for many fields such as quantum optic, quantum electrodynamics resonance and narrow spectrum laser [11-13]. The microspherical laser with the size from a few microns to several tens of microns is one of the photonic device subjects that is most interested in research due to pump light and emission laser have been strongly held in microsphere thanks to the total reflection on inside surface of device, so ultra-low laser emission threshold and ultra-narrow laser emission spectrum. The optical micro-resonant lasers with features such as ultra-low laser emission threshold, ultra-narrow spectral width, controlled the number of emission modes depending on the structure of the micro- resonance and the techniques to collect the emission signals from micro-resonant cavity have become development research subjects of photonic sensors for biochemical and environment with ultra-high sensitivity [14-18]. Now, the research on optical micro-resonant lasers in general and microspherical lasers, in particular, has given a lot of new information on photonic physics and they are still very active research subjects in the world [19-21]. In general, the research and fabrication of nano and micro- photonic materials and devices in recent years in Vietnam has been achieved many important results. The laboratory for fiber optic applications and materials belong to Institute of Materials Science has been successfully fabricated 1D-PhC structure and has international publications as well as a number of PhDs successfully defended their thesis about this research content including experimental fabrication and related applications [22,23]; the photonic sensors based on wavelength selection in 1D-PhC structure fabricated from porous silicon multi-layer membranes were initially 3 applied in equipments for measuring biochemical environments [23,24]; the fiber optic devices with wavelength selection structure based on FBG have been researched and developed for optical communication networks and optical sensors [25,26],… With the 3D-PhC structure, the researchers have also successfully fabricated spherical micro-resonant cavity lasers based on Er3+-doped silica- alumina glass emitting 1550 nm region WGM modes for optical communication and the visible region applied to sensors with rather strong intensity, ultra-narrow spectrum width and controlled the number of emission modes from micro-resonant cavity [27,28]. Besides, there are some research works on photonic devices based on 2D-PhC by simulation have achieved very positive results [29-32] and opened up new research directions on photonic devices, including optical amplification by experimental method combined with simulation calculation. On the basis o ...