Study On Electromagnetically Induced Transparency And Absorption Application Of Surface Plasmon Resonance

Surface plasmons are electromagnetic waves propagating along the interface of metal/dielectric caused by the collective oscillation of light and free electrons.As an electromagnetic wave propagating along the surface of a conductor,the control of surface plasmons can be achieved by changing the structural design of the metal surface,which would further influence the interaction between light and free electrons.Surface plasmons provide new ways and possibilities for the development of new photonic devices and miniaturization of photonic circuits due to their characteristics of breaking the limits of conventional optical diffraction and binding electromagnetic energy in the near field.The unique two-dimensional character of surface plasmons leads them having a great potential in the developments of subwavelength optics,data storage,novel light sources,sensors,and bio-photonics.This paper focus on the surface plasmons and discuss the applications of plasmon induced transparency and absorption to provide sufficient theoretical support and foundation for their further experimental studies.The specific research including:"Coupling of surface plasmons induced the electromagnetically induced transparency and its dual modulation mode sensing","Surface plasmons induced the coupling of dark modes leading the electromagnetically induced transparency and its application of sensing"and"Surface plasmon induced perfect absorption in near infrared band".This paper consists of the following six sections:To clarify the research purpose and main content,Chapter 1 introduces the research background and basic theory of surface plasmons from Maxwell’s equations,as well as the applications of plasmon induced transparency and absorption.Chapter 2 systematically introduces the theoretical methods used in this thesis:the time-domain finite difference method,the transfer matrix method,the dispersion model of metals and the two-oscillator coupling theory.Chapter 3 presents a simple nanosystem consisting of a gold grating and a dielectric-metal-medium three-layer structure.The coupling of two surface plasmon resonance modes at the upper and lower interfaces of the silver layer leads to the plasmon induced transparency effect.The damping characteristics and coupling modes of two surface plasmon modes are quantitatively investigated by the two-oscillator coupling theory.In addition,its reflection spectra,electromagnetic field distribution and sensing properties are also investigated.The effects of structural parameters variations on plasmon induced transparency effect and sensing performance are further analyzed.This work enriches the applications of plasmon induced transparency effect,enabling simultaneous wavelength-modulated and intensity-modulated sensing.Chapter 4 introduces a composite nanosystem using surface plasmons to induce the coupling of dark-dark modes,which achieves a plasmon induced transparency effect at visible frequencies.The effect of this nanosystem is analyzed using the simulated field distribution and theoretical results derived from equation calculations.In addition,the effects of structural parameters and refractive index of different layers on plasmon induced transparency effect and their sensing performance are further investigated.This work contributes to the researches on the coupling of two dark modes induced by surface plasmons to form plasmon induced transparency effects and their applications in sensing.Chapter 5 proposed a nanosystem composed of a triple-layer Ti/SiO₂/Ti N nanofilm structure,which achieves a good absorption performance under the induction of surface plasmons.The absorption ability is investigated by the time-domain finite-difference method and the transfer matrix method.In addition,the effects of variations of incidence angle,the polarization states of incidence light,material,and structural parameters on the absorption performance are investigated in detail.The proposed near-infrared absorber has potential application prospects in solar collectors,thermal emitters,and solar cells,owing to its high absorption,ultra-broadband bandwidth,insensitivity to incident angle and polarization state,low cost,and simple preparation process.Chapter 6 summarizes the above work,analyzes the strengths and weaknesses of the study,and provides an outlook for further work to be carried out in the future.