Room Temperature Excitonic Whispering Gallery Mode Lasing from High‐Quality Hexagonal ZnO Microdisks

Chen, Rui; Ling, Bo; Sun, Xiao Wei; Sun, Hanwu

doi:10.1002/adma.201100423

Cited by 254 publications

(234 citation statements)

References 40 publications

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“…The laser is obtained by free-space excitation and the lasing emission is directly used for sensing applications, such as refractive index change in the medium outside a cavity. [5,6] WGM lasers have been recently integrated to living cells for intracellular sensing and cell tracking, which opens a new frontier of biotechnology. [7,8] WGM lasers made of polymers of biological origin are of interest for biosensing.…”

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confidence: 66%

Microsphere Solid‐State Biolasers

Caixeiro

Fernandes

et al. 2017

Advanced Optical Materials

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Biolasers obtained from biomaterials are attracting a wealth of interest for their potential as future biosensors with enhanced sensitivity, and advanced cell tracking. Here, miniature biolasers are reported, which are formed by bovine serum albumin (BSA) protein and biosourced polysaccharides derived from land plants such as cellulose and pectin. Using a green processing route aided by simple emulsions, solid-state microspheres with diameters of 15–100 µm are fabricated and utilized as whispering gallery mode lasers with thresholds of a few µJ mm–2 and quality factors of up to 3000. Furthermore, BSA microlasers are found to be compatible with cell growth and resistant to the aqueous environment of cell culture media. This environmentally friendly and biocompatible design shows promise for future implantable biosensing devices opening a path between laser science and medicine

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confidence: 66%

Microsphere Solid‐State Biolasers

Caixeiro

Fernandes

et al. 2017

Advanced Optical Materials

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“…As a result, the emission peak at 379 nm can be attributed to the room-temperature exciton recombination emission, and the other emission peak at 390 nm maybe originate from the P-band emission due to the exciton-exciton collision at high exciton density condition. 38,39 The collision between the excitons becomes more intensive with the increase of the excitation power intensity, eventually the exciton emission was totally changed to the P-band emission. Figure 5(a) shows the UV near band edge emission spectra from the ZnO:Sn microdisks excited by focused laser pulses with different excitation power densities.…”

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confidence: 82%

Controllable fabrication and optical properties of Sn-doped ZnO hexagonal microdisk for whispering gallery mode microlaser

Dai

et al. 2013

APL Materials

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We report a controllable method for fabricating hexagonal Sn doped ZnO microdisks. The photoluminescence mechanism of the Sn doped ZnO microdisks is investigated, the defect emission is attributed to the singly charged oxygen vacancy. Under the excitation of a femtosecond pulsed laser with a wavelength of 325 nm, exciton-exciton collision process is clearly demonstrated, and amplified spontaneous emission is further realized under strong excitation. Using the perfect hexagonal symmetric structure of the Sn doped ZnO microdisks, the whispering-gallery mode lasing with high quality factor and fine mode structure is obtained from a single microdisk

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“…6) of a ZnO microwire (R ¼ 1.66 mm), fabricated by carbothermal evaporation. Also lasing modes are generally found to be of WGM type [29,31,42]. However, in Fig.…”

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confidence: 99%

Whispering gallery modes in deformed hexagonal resonators

Grundmann

Dietrich

2012

Physica Status Solidi (b)

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Optical resonances in polygonal resonators are due to whispering gallery modes (WGM). We investigate WGM in regular and deformed hexagonal ZnO microwire resonators. Four types of geometries are investigated: regular hexagonal and dodecagonal cross sections, hexagonal cross section elongated for one pair of facets and hexagonal cross section deformed by bending (uniaxial stress). Experimental data on mode energies and angular dispersion are correlated with model calculations and Poincaré surfaces of section. Hexagonal (ϕ = 60°), square (ϕ = 45°), triangular (ϕ = 30°), and Fabry–Pérot modes (ϕ = 0°) are observed in the various investigated geometries, ϕ being the angle of incidence at the facets with respect to the normal direction. magnified image Hexagonal WGMs (green, 6‐WGM), triangular (red, 3‐WGM), and double‐triangular (blue, D3‐WGM) rays in regular hexagons, elongated hexagons and hexagons deformed by bending. Triangular WGMs are stable modes in all three resonators. Hexagonal modes are not stable in the bent hexagon.

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Room Temperature Excitonic Whispering Gallery Mode Lasing from High‐Quality Hexagonal ZnO Microdisks

Cited by 254 publications

References 40 publications

Microsphere Solid‐State Biolasers

Microsphere Solid‐State Biolasers

Controllable fabrication and optical properties of Sn-doped ZnO hexagonal microdisk for whispering gallery mode microlaser

Whispering gallery modes in deformed hexagonal resonators

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