Light emission from a dye-coated glass microsphere

Wang, Jiyou; Wang, Min; Liu, Ling; Wei, Hao; Hou, Bingzhe; Lü, Ying

doi:10.1016/j.jlumin.2006.01.334

Cited by 7 publications

(6 citation statements)

References 13 publications

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“…Existence of WGMs and their effect on the decay rate in polymer beads has been reported earlier [11,14,15,17]. Work on coated microspheres and microcrystals is scarce in the literature [18][19][20][21][22][23]. Large diameter beads possess high-Q modes that are very sharp and clustered.…”

Section: Introductionmentioning

confidence: 90%

“…Figure 1 shows the schematic of the microcavities studied in this work. According to the Lorenz-Mie scattering theory, the separation between the adjacent WGMs (or free spectral range, FSR) for a homogeneous sphere is approximated by [23]…”

Section: Methodsmentioning

confidence: 99%

“…3. The simulations in this case have been carried out by taking the value of the refractive index of coated dye as 1.40 [23]. It is to be noted that the simulations were extremely sensitive to the refractive index and the thickness of the mantle.…”

Section: A Wgm At Small Size Parametersmentioning

confidence: 99%

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High-Q whispering gallery modes of doped and coated single microspheres and their effect on radiative rate

Dantham¹,

Bisht²

2009

J. Opt. Soc. Am. B

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Fluorescence spectra of two organic dyes doped in polymer beads as well as coated on single microparticles of silica exhibit whispering gallery modes (WGMs). For doped microspheres, theoretical simulations on WGMs have been carried out based on the Lorentz-Mie theory by varying the refractive index and the diameter of the microparticle. Similarly, for a coated microsphere, an Aden and Kerker model of the Lorentz-Mie theory has been used to simulate WGMs. For diameters ജ8 m, low-resolution simulations of scattering efficiency fail to show modes of higher-quality factors ͑Q ϳ 10 8 ͒. A new procedure of identifying these modes is given here that does not require use of high-performance computing. Effects of WGMs on decay rates have also been studied. It has been found that, while doped microparticles exhibit no effect on the radiative rate, coated microparticles show inhibition of the decay rate for smaller sizes. Decay rates of single-coated microspheres are found to be distinctly different from those of randomly shaped single microcrystals.

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Section: Introductionmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

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High-Q whispering gallery modes of doped and coated single microspheres and their effect on radiative rate

Dantham¹,

Bisht²

2009

J. Opt. Soc. Am. B

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“…The coating, moreover, can improve the microcavity properties and/or add novel optical functions [ 86 , 87 ]; the only limitation may be due to the fact that the Q of a microsphere coated with an optically-active material is generally reduced compared to the Q of the uncoated one, due to the absorption in the coating and to the scattering at the sphere-coating interface. Spherical microresonators have been coated by a number of materials, such as, just to mention a few of them, conjugated polymers [ 88 ], PMMA [ 89 ], fluorescent dyes [ 90 , 91 , 92 ], nanocrystalline silicon [ 83 ], silica-hafnia glass and glass-ceramic [ 20 , 93 , 94 ], polystyrene and calcium fluoride [ 95 ], zeolite [ 96 ], HgTe quantum dots [ 97 ], etcetera. The low-pressure chemical vapor deposition (LPCVD) method was found to produce films of very low surface roughness, an important requirement for the films to be usable on WGMRs [ 98 ].…”

Section: Microspherical Resonatorsmentioning

confidence: 99%

Biosensing by WGM Microspherical Resonators

Righini

Soria

2016

Sensors

119

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Whispering gallery mode (WGM) microresonators, thanks to their unique properties, have allowed researchers to achieve important results in both fundamental research and engineering applications. Among the various geometries, microspheres are the simplest 3D WGM resonators; the total optical loss in such resonators can be extremely low, and the resulting extraordinarily high Q values of 108–109 lead to high energy density, narrow resonant-wavelength lines and a lengthy cavity ringdown. They can also be coated in order to better control their properties or to increase their functionality. Their very high sensitivity to changes in the surrounding medium has been exploited for several sensing applications: protein adsorption, trace gas detection, impurity detection in liquids, structural health monitoring of composite materials, detection of electric fields, pressure sensing, and so on. In the present paper, after a general introduction to WGM resonators, attention is focused on spherical microresonators, either in bulk or in bubble format, to their fabrication, characterization and functionalization. The state of the art in the area of biosensing is presented, and the perspectives of further developments are discussed.

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“…The separation between the adjacent WGMs (or the free spectral range, FSR) for a coated sphere is approximately given by Wang et al [18] …”

Section: Wgms Of a Microspherementioning

confidence: 99%

Whispering gallery modes and effect of coating on Raman spectra of single microspheres

Dantham

Bisht

Dobal

2011

J Raman Spectroscopy

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Raman spectra and fluorescence of BaTiO 3 and silica microspheres of different sizes have been studied. The observed whispering gallery modes (WGMs) have been assigned using theoretical simulations based on the Lorenz-Mie theory. The WGMs are found to have selective enhancements in the Raman spectra. The variations in the Raman spectra with the radial position of the excitation spot and excitation wavelength have been correlated with the morphology-dependent internal field distributions of the microspheres. The effect of a thin dye coating on the fluorescence and Raman spectra was studied, and a coating thickness of ∼200 nm was estimated from the theoretical simulation of experimentally observed data based on the Aden and Kerker theory.

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Light emission from a dye-coated glass microsphere

Cited by 7 publications

References 13 publications

High-Q whispering gallery modes of doped and coated single microspheres and their effect on radiative rate

High-Q whispering gallery modes of doped and coated single microspheres and their effect on radiative rate

Biosensing by WGM Microspherical Resonators

Whispering gallery modes and effect of coating on Raman spectra of single microspheres

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