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Investigating Frequency, Phase, and Amplitude Singularities in a Hybrid Plasmonic System

Dastangoo, Fatemeh | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54669 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi Bonabi, Rasoul
  7. Abstract:
  8. In recent years, nanoplasmonic quantum has been an active and developing field, resulting in several quanta and nonlinear qualities in the time-frequency interval, such as the creation of coherent single photons, nonlinear observation in nanometer dimensions, high-speed optical switch, etc. In the meantime, the controlled emission of surface polaritons resulted in the development of new devices such as nanolasers , subwavelength diodes, and high-speed phase and amplitude modulators , all of which have had a significant impact on the development of technology in very miniature dimensions. Numerous approaches have been proposed for the manufacturing of nanolasers, or reinforced plasmon polaritons, the majority of which are based on induced emission of radiation or the employment of high-power pulsed lasers (lasers with a power of several watts) to achieve high inversion. Applying high-power lasers or extremely concentrated gain mediums (up to a few tenths of a molar concentration) around the plasmonic system creates damaging consequences such as dephasing and low efficiency, limiting the use of this plasmonic device in manufacturing micron and optical chips. It is possible to generate linear (plasmon The present study aimed to generate the frequency singularity in a hybrid system that contains an atomic and a metamaterial layer. The atomic layer is a gaseous system, such as rubidium atoms, cooled to the magnetic systems up to the milikelvin temperature. Alternatively, these atoms can be thought of as charged particles impurity doped in a clear crystal and cooled to a few Kelvin temperature, with the metamaterial layer consisting of Al2O3 and Ag2O3 with a nano-fishnet structure. This frequency singularity will be highly effective in generating coherent amplified light (nanolaser), plasmonic coherent perfect absorption, and the laser-coherent absorber simultaneous operation. This model is used to make plasmonic single-throw switches, as well as highly fast phase and amplitude modulators. The implementation steps of this proposed system to perform this project is an atomic system activated by resonant cyclic laser beams and spatiotemporal coherence. The frequency band of resonant ring lasers is quite narrow, but it is still nearly unparalleled. Electro-optical resistors are also used to control the frequency of these lasers. Such an atomic system is placed over a metamaterial layer, assuming that at the frequency amplified by the bipolar atomic transition, this layer has an extremely minimal ohmic loss. The optical characteristics of atoms at the metamaterial level can be adjusted by changing the amplitude and frequency of laser beams. The plasmon system's refractive index will be adjusted particularly based on spatial changes as a result of this alteration. It was found that these precise alterations resulted in frequency singularity, finally leading to the observation of the laser, the plasmonic coherent absorber, and the laser-coherent absorber simultaneous operation. As a result, the dissertation's procedures can be summarized as follows: modelling the atomic system and its adaptation to the laboratory atomic systems; optimizing the frequency and strengthening the laser fields, as well as their radiation in conjunction with the atomic system, investigating the laser interaction and plasmon hybrid system, as well as laser probe dynamics frequency singularity generation. As expected, after doing this dissertation, a plasmon hybrid system is designed which is employed as a nanolaser and plasmon coherent adsorbent based on the constructive and destructive interference of both polarity waves. The plasmon laser is anticipated to be visible up to several tens of microwatts by this model, and its efficiency is predicted to be up to 30% in the optimal operation and optimized system. There is no requirement for high-density material or large laser field capacity due to its optimization and the direction of laser generation. The power required to develop and propagate these plasmon waves is predicted to be few microwatts, which may be easily generated and propagated in the laboratory using a high-spatiotemporal coherence laser
  9. Keywords:
  10. Nonlinear Surface Poalritons ; Plasmon Nanolasers ; Plasmonic Absorbers ; Plasmonic Coherent Perfect Absorption ; Singularity

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