Mie scattering analysis of spherical Bragg "onion" resonators

Liang, Wei; Xu, Yong; Huang, Yanyi; Yariv, Amnon; Fleming, J. G.; Lin, Shawn Yu

doi:10.1364/opex.12.000657

Cited by 27 publications

(12 citation statements)

References 16 publications

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“…Resonators have been mainly investigated for whispering gallery modes lasing because of their high quality factor, low threshold, and simple fabrication procedures. In addition, theoretical discussions underlining unique features have been presented on Bragg resonators having perfect spherical symmetry, namely Bragg onion resonators [139][140][141][142]. These latter are based on alternating concentric shells of different refractive-index materials.…”

Section: Microlasermentioning

confidence: 99%

Cholesteric solid spherical microparticles: chiral optomechanics and microphotonics

Hernández

Provenzano

Mazzulla

et al. 2016

Liquid Crystals Reviews

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This manuscript reviews the main results from the investigations performed on solid chiral micro-particles based on polymerized cholesteric droplets. The procedures of particles generation, the structural characterization, optomechanics and microphotonics investigations, are shown. The aim of this work is to give a picture of the innovation introduced by exploring the combination of chirality, self-organization and solid structure.

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Section: Microlasermentioning

confidence: 99%

Cholesteric solid spherical microparticles: chiral optomechanics and microphotonics

Hernández

Provenzano

Mazzulla

et al. 2016

Liquid Crystals Reviews

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“…where Q ext is a single particle extinction efficiency with diameter d, and refractive index m at wavelength k, which can be calculated exactly by the Mie theory for spherical particles, N(d) is the number particle size distribution, s ext is the over extinction coefficient (Liang et al 2004). The exact extinction coefficient can be obtained by solving the single particle extinction efficiency using a complex numerical method firstly based on the Mie theory, and then integrating over the polydispersed aerosol particle size distribution (Jung and Kim 2007).…”

Section: Introductionmentioning

confidence: 99%

Theoretical Estimation of Extinction Coefficient Due to Time Evolution of Particle Size Distribution

Tang

Lin

2012

Particulate Science and Technology

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The extinction coefficient of atmospheric aerosol particles influences the earth's radiation balance directly or indirectly and it can be determined by the scattering and absorption characteristics of aerosol particles. The problem of estimating the change of extinction coefficient due to time evolution of particle size distribution is studied and an improved method for calculating the single particle extinction efficiency is proposed. Through this improved method, the single particle extinction efficiency can be expressed simply in powers of particle diameter based on the anomalous diffraction approximate for the particle size range from 0.1 to 10 mm in diameter first, and then the change of the overall extinction coefficient undergoing (individually and simultaneous) Brownian and gravitational coagulation as well as condensation can be estimated comprehensively with the moment method based on the general dynamic equation. The feasibility and reliability of this method are investigated and the effect of time evolution of particle size distribution on the extinction coefficient is also estimated systemically. Simulation experiments indicate that the extinction coefficient obtained with the improved method coincides fairly well with that using the Mie theory, which provides a simple, dependable, and efficient method to estimate the change of extinction coefficient during the particle dynamic processes.

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“…For an evanescently coupled planar waveguide-microsphere system the total scattering losses in a microsphere will be the sum of losses due to: internal scattering or absorption and external surface radiation [55,56,57,58]. We will derive the analytic expressions assuming that there are minimum or no coupling losses in the microsphere-waveguide system.…”

Section: -3-2 Loss Mechanisms (Intrinsic and Extrinsic)mentioning

confidence: 99%

“…For d ~ a, the beams will be used in the scattering and absorption losses. By using thermodynamical calculations the attenuation coefficient due to internal losses can be derived as [55][56][57][58]:…”

Section: -3-2-1 Microsphere Intrinsic Scattering and Absorption Lossesmentioning

confidence: 99%

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Guided Wave Resonant Optical Structures and LED Micro Resonators for Biosensing Applications

Goswami¹

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Guided Wave Resonant Optical Structures and LED Micro Resonators for Biosensing Applications Rohit Goswami Integrated opto-electronic and nanophotonic devices for sensing application in the fields of medicine, microbiology, environmental, safety and defense have attracted considerable attention due to their potential for achieving greater compactness, shorter response times and higher sensitivities as compared to non-optical sensing systems. Optical cavity resonant devices such as Fabry-Perot interferometers have been extensively used in lasing applications and optical sensing has been accomplished through many similar technologies. Fiber optic and planar waveguide based resonant devices which use evanescent waves for detection of refractive index changes are one of the most widely used approaches for photonic sensors. In this work we investigate the simulations, fabrication and characterization of resonant optical cavity devices for sensing applications. Morphology Dependent Resonances (MDRs) of planar, micro-spherical and micro-cylindrical cavities were reviewed for resonance line widths, spacing between modes, and density of resonances and experimental observations of internal and external field distributions. We focus on planar thin film stacked resonant waveguide geometries, microsphere-waveguide coupled resonances, cylindrical Gallium Nitride (GaN) microdisks for passive detection of Whispering Gallery Modes (WGMs) and electrically pumped active Resonant Cavity (RC) LED disk geometries for Vertical Cavity Modes (VCMs) as structures of interest. Advances in stacked thin film coupled waveguide sensors enhance the selectivity and sensitivity by measuring the changes of the resonant optical modes and provide an integrated platform for label-free molecular detection. The effective surface loading detection sensitivity of the planar coupled alumina waveguide transducer was determined to be 20 pg/mm 2 with a bulk index sensitivity of 5.6×10-4 Refractive Index Units (RIU) for aqueous sucrose solutions. For circular geometry based resonators, as the physical device size approaches the wavelength of light the MDRs are enhanced by retaining longer photon path length times and enhancing detection due to its high Q factors. Circular micro-cavities not only modify the optical resonances but also distribute the resonant frequencies as compared to a planar macro-cavity. The waveguide-coupled microspheres were experimentally detected to have a minimum surface coverage limit of 0.192%. Passive WGMs in GaN micro-disks showed a variation in mode spacing of 3nm to 7nm (λ 2 /2πRn) as disk radius was reduced from 4.5µm to 2µm. Micro-cylindrical Distributed Bragg Reflector (DBR) RCLEDs were designed for layer thicknesses and Multi Quantum Well (MQW) placement to enhance VCMs and LED emission output. Experimental and simulated LED spectral minima matched at 432 nm and 451 nm confirming VCMs related to (λ/2) cavity resonances.

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Mie scattering analysis of spherical Bragg "onion" resonators

Cited by 27 publications

References 16 publications

Cholesteric solid spherical microparticles: chiral optomechanics and microphotonics

Cholesteric solid spherical microparticles: chiral optomechanics and microphotonics

Theoretical Estimation of Extinction Coefficient Due to Time Evolution of Particle Size Distribution

Guided Wave Resonant Optical Structures and LED Micro Resonators for Biosensing Applications

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