Whispering gallery mode lasing from InGaN/GaN quantum well microtube

Li, Yufeng; Feng, Lishuang; Su, Xilin; Li, Qiang; Yun, Feng; Gao, Yuan; Han, Jung

doi:10.1364/oe.25.018072

Cited by 16 publications

(21 citation statements)

References 42 publications

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“…Figure 3a shows the PL spectra of a microtube in PDMS, which was excited from 24.5 µJ/cm 2 to 27.0 µJ/cm 2 . All spectra correspond to the TM polarization mode due to the fact that the TE mode was not sustainable for such thin-walled microcavities [32]. The optical mode separation (free spectral range (FSR)) was measured at around 4.0 nm when λ was 430 nm, which matched the calculations using the periodic boundary condition 2πn eff R = mλ.…”

Section: Resultssupporting

confidence: 58%

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Low-Threshold and Wavelength-Tunable InGaN Tubular WGM Laser Embedded in a Flexible Substrate

Zhang

et al. 2021

Crystals

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We have fabricated a tubular whispering gallery mode laser based on InGaN/GaN quantum wells and transferred it onto a flexible substrate. Compared with those without the transferring processes, the threshold energy density was reduced by 60%, at about 25.55 µJ/cm2, while a high-quality factor of >15,000 was obtained. Finite-difference time-domain simulation demonstrated that such a low threshold energy density can be attributed to the decreased mode volume, from 1.32 × 10−3 μm3 to 6.92 × 10−4 μm3. The wavelength dependences on strain were found to be 5.83 nm, 1.38 nm, and 2.39 nm per stretching unit ε in the X, Y, and Z directions, respectively. Such strain sensitivity was attributed to the deformation of the GaN microtube and the change in the refractive index of the PDMS.

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Section: Resultssupporting

confidence: 58%

“…Due to the lattice mismatch between the stress-generating layers, selfrolling occurred when the sacrificial layer was removed and microtubes were formed. A more detailed process can be found in our previous work [32,33].…”

Section: Microtubes Preparationmentioning

confidence: 99%

Low-Threshold and Wavelength-Tunable InGaN Tubular WGM Laser Embedded in a Flexible Substrate

Zhang

et al. 2021

Crystals

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“…The tubular microcavities supporting whispering gallery modes (WGMs) have attracted much attention due to their unique properties, such as subwavelength dimension, light polarization, and superior optical confinement due to the absence of higher‐order radial modes. That makes them promising for different nanophotonics applications, including lasing . A variety of techniques were exploited to fabricate tubular resonators from so‐called “epitaxial casting” when a core is etched in a core‐shell column to direct lithography formation .…”

Section: Tmd Tubes As Optical Resonatorsmentioning

confidence: 99%

“…That makes them promising for different nanophotonics applications, including lasing. [93,94] A variety of techniques were exploited to fabricate tubular resonators from so-called "epitaxial casting" when a core is etched in a core-shell column to direct lithography formation. [95,96] The rolling-up strained thin films or membranes were also used to form tubular micro-resonators.…”

Section: Tmd Tubes As Optical Resonatorsmentioning

confidence: 99%

Excitonic Emission in van der Waals Nanotubes of Transition Metal Dichalcogenides

et al. 2019

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Nanotubes (NTs) of transition metal dichalcogenides (TMDs), were first synthesized more than a quarter of a century ago; nevertheless, many of their optical properties have so far remained basically unknown. Herein, the state of the art in the knowledge of the optical properties of TMD NTs is presented. First, general properties of multilayered crystals are evaluated, and available data on related NTs are analyzed. Then, the technology for the formation and the structural characteristics of NTs are represented, focusing on the structures synthesized by chemical transport reaction. The core of this work is the presentation of the ability of synthesized TMD NTs to emit bright photoluminescence (PL), which has been discovered recently. By means of micro-PL spectroscopy of individual tubes, we show that excitonic transitions relevant to both direct and indirect band gaps contribute to the emission spectra of the NTs despite having the dozens of monolayers in their walls. The performance of the tubes as efficient optical resonators is highlighted, where confined optical modes strongly affect the emission. Finally, a brief conclusion is presented, along with an outlook of the future studies of this novel radiative member of the NTs family, which have unique potential for different nanophotonics applications.

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“…Finding a way to fabricate the electrodes and to make them fit the micro/nano devices effectively and completely without reducing the light output is currently being sought by researchers. In our previous work 32 , we have successfully fabricated micro-tubes by strain-induced self-rolling of a InGaN/GaN quantum wells nanomembrane. Freestanding quantum wells micro-tubes, with a diameter of 6 μm and wall thickness of 50 nm (Fig.…”

Section: Resultsmentioning

confidence: 99%

3D ITO-nanowire networks as transparent electrode for all-terrain substrate

Tian

Zhang

et al. 2019

Sci Rep

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A 3D ITO nanowire network with high quality by using polystyrene as an assisted material has been prepared, demonstrating superior optoelectronic performances with a sheet resistance of 193 Ω/sq at 96% transmission. Both remarkable flexibility tested under bending stress and excellent adhesion applied on special terrain substrate have been achieved. This method has led to a full coverage of micro-holes at a depth of 18 µm and a bottom spacing of only 1 µm, as well as a perfect gap-free coverage for micro-tubes and pyramid array. It has been proved that this 3D ITO nanowire network can be used as a transparent conductive layer for optoelectronic devices with any topography surface. Through the application on the micro-holes, -tubes and -pyramid array, some new characteristics of the 3D ITO nanowires in solar cells, sensors, micro-lasers and flexible LEDs have been found. Such 3D ITO nanowire networks could be fabricated directly on micro-irregular substrates, which will greatly promote the application of the heterotypic devices.

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Whispering gallery mode lasing from InGaN/GaN quantum well microtube

Cited by 16 publications

References 42 publications

Low-Threshold and Wavelength-Tunable InGaN Tubular WGM Laser Embedded in a Flexible Substrate

Low-Threshold and Wavelength-Tunable InGaN Tubular WGM Laser Embedded in a Flexible Substrate

Excitonic Emission in van der Waals Nanotubes of Transition Metal Dichalcogenides

3D ITO-nanowire networks as transparent electrode for all-terrain substrate

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