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SPASER-based Metal-dielectric Nanolasers And Their Surface Plasmon Amplification Characteristics

Posted on:2015-12-16Degree:MasterType:Thesis
Country:ChinaCandidate:H P ZhangFull Text:PDF
GTID:2298330422492982Subject:Optics
Abstract/Summary:PDF Full Text Request
By doping gain material into the dielectric material of metal-dielectric nanosystem, the energyloss of metal LSPR can be compensated and the amplified LSPR output can be formed, SurfacePlasmon (SP) Amplification by Stimulated Emission of Radiation (SPASER), and enormouslychange the optical absorption and scattering properties.Due to the great enhancement of the LSPR energy and scattering of the metal-dielectricnanosystem, great attention has been focus on the relative researches of the SPASER-basednanolaser, various SPASER nanosystem has been proposed theoretically and demonstratedexperimentlly. However, the endeavors of the modification of the SPASER nanosystem to furtherimprove the performance on energy amplification never stop.In this paper, several metal-dielectric SPASER nanosystems are proposed, simulated andanalysed. In the meantime, the Surface Enhanced Raman Scattering single molecule detectionbased on SPASER nanoantenna is also discussed.In the first chapter, the proposal of the metal-dielectric nanosystem and its physicalmechanism is introduced, and its developments of theoretically and experimentally research arelisted in detail. The research methods are listed and the main content of this paper is also provided.In the second chapter, the silica-gold-silica three layers nanoshell SPASER system isproposed and its optical characristics is analyzed. We found that, when the stable operatedSPASER mechanism is established by doping gain material in silica, the optical absorption andscattering properties is greatly changed; especially there is5~6order of magnitudes enhancementof scattering cross-section. Meanwhile, the optical properties and the enhancement of the scatteringcan be further modified by changing its geometrical parameters. The plasma hybrid theory,quenching effect and SPASER mechanism is introduced to explain its optical characristics.In the third chapter, the three layers nanoshell SPASER system is modified, the silica core isoffsetted form the center of nanoshell, and the multi-wavelengths LSPR amplified output isrealized. In addition, the influences of polarization angle of the incident light on the outputcharacristics are also discussed. We found that, the output wavelength and output strength can becontrolled by changing the polarization angle of incident ligh without any adjustment of thegeometrical parameters. In the fourth chapter, the SPASER-based Bowtie nanoantenna is proposed and its value insingle molecule detection of Surface Enhanced Raman Scattering is proved. Bowtie nanoantennacan combine the “hot spot” and “tip effect” to realize the great enhancement of LSPR, when theSPASER mechanism is introduced, not only the LSPR strength is further enhanced, but also thewhole surface of Bowtie antenna is covered by the high strength local electric field which cangreatly enlarger the effect area for single molecule detection. Therefore, SPASER-based Bowtienanoantenna is of great value in the applications of single molecule detection of Surface EnhancedRaman Scattering.In the fifth chaper, the conclusions and potentially applications of the SPASER-based metal-dielectric nanosystem are given.In summary, the proposed metal-dielectric SPASER nanosystem and its theoretical analysis isnot only provide the principle for the design, production and applificaiton of nanolaser, but alsooffer reference meaning for the further research and exploration of the Surface Plasmon (SP)Amplification by Stimulated Emission of Radiation mechanism.
Keywords/Search Tags:LSPR, SPASER, nanolaser, nanoantenna
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