Single-Nanowire Single-Mode Laser

Xiao, Yao; Meng, Chao; Wang, Pan; Yu, Yingjie; Yu, Hua; Wang, Shanshan; Gu, Fuxing; Dai, Li‐Xin; Tong, Limin

doi:10.1021/nl1040308

Cited by 212 publications

(185 citation statements)

References 41 publications

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“…Another possible way is to select a common mode from two coupled cavities by using the Vernier effect 52, 53. The third approach54 is based on expanding the free space range of the multimodes by significantly shortening the optical path of the lasing cavity, until only one mode is left 55. As shown in Figure 6 a–c, when the platelet decreases to ≈2 μm, only one lasing mode can be observed.…”

Section: Resultsmentioning

confidence: 99%

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

et al. 2016

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Organic–inorganic metal halide perovskites have recently demonstrated outstanding efficiencies in photovoltaics as well as highly promising performances for a wide range of optoelectronic applications such as lasing, light emission, optical detectors, and even for radiation detection. Key to the realization of functional perovskite micro/nanosystems on the ubiquitous silicon optoelectronics platform is through sophisticated lithography. Despite the rapid progress made in halide perovskite lasing, direct lithographic patterning of perovskite films to form optical cavities on conventional substrates remains extremely challenging. This study realizes room‐temperature high‐quality factor whispering‐gallery‐mode lasing (Q ≈ 1210) from patterned lead halide perovskite microplatelets fabricated in periodic arrays on silicon substrate with micropatterned BN film as the buffer layer. By varying the size of the platelets, modal selectivity for single mode lasing can be achieved with different cavity sizes or by simply breaking the structural symmetry of the cavity through designing the pattern. Importantly, this work demonstrates a straightforward, versatile bottom‐up scalable strategy to realize high‐quality periodic perovskite arrays with variable cavity sizes for large‐area light‐emitting and optical gain applications.

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Section: Resultsmentioning

confidence: 99%

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

et al. 2016

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“…For example, color tunability of individual silicon nanowires 9 and multicolored vertical silicon nanowires 10 are two recent demonstrations of resonant nanowire and electromagnetic wave interactions. Beside coloration, light confinement, leaky-mode resonances, and nonresonant interference effects can be used to tune and enhance light absorption in a wide range of highperformance, nanowire-based photonic and optoelectronic devices, including lasers, 11 solar cells, 12 chemosensors, and photodetectors. 13 However these examples are exclusively for single dielectric or semiconducting nanowires or their arrays that cannot be easily scaled up for mass production.…”

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confidence: 99%

“…FDTD simulations with wavelength-dependent refractive indices and extintion coefficients reproduce the measurement peaks confirming the resonant scattering effect from the coreÀshell nanowires (Figure 3d) assuming TM polarized light. Blue and green peaks are identified as TM 01 and the red peak as TM 11 . The scattering efficiency of TE polarization is known to be smaller compared to the TM polarization.…”

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confidence: 99%

“…By using the above formula, we obtain n eff = 2.65 (for m = 2), which is close to the refractive index of As 2 Se 3 core (2.95) at this wavelength (see Figure S2, Supporting Information). Lower n eff is expected because the mode TM 11 is not confined only at high-index core. The scattering efficiency and resonance wavelength can be directly calculated from LorenzÀMie theory for unpolarized incident light 18 Q sca ðxÞ ¼ 1…”

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confidence: 99%

“…The core diameter determines the structure and the number of whispering gallery type modes resonating inside the nanowire ( Figure S5, Supporting Information). The resonance conditions for the Mie scattering case are identified as TM 01 , TM 11 , and TM 21 . A single resonant mode is observed for dimensions smaller than 50 nm, and additional modes appear for increasing diameter of nanostructures.…”

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confidence: 99%

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Structural Coloring in Large Scale Core–Shell Nanowires

et al. 2011

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We demonstrated two complementary size-dependent structural coloring mechanisms, interference and scattering, in indefinitely long coreÀshell nanowire arrays. The unusual nanostructures are comprised of an amorphous semiconducting core and a polymer shell layer with disparate refractive indices but with similar thermomechanical properties. CoreÀshell nanowires are mass produced from a macroscopic semiconductor rod by using a new top-to-bottom fabrication approach based on thermal size reduction. Nanostructures with diameters from 30 to 200 nm result in coloration that spans the whole visible spectrum via resonant Mie scattering. Nanoshell coloration based on thin film interference is proposed as a structural coloration mechanism which becomes dominant for nanowires having 700À1200 nm diameter. Controlled color generation in any part of visible and infrared spectral regions can be achieved by the simple scaling down procedure. Spectral color generation in mass-produced uniform coreÀshell nanowire arrays paves the way for applications such as spectral authentication at nanoscale, light-scattering ingredients in paints and cosmetics, large-area devices, and infrared shielding.

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Solution‐Processed Low Threshold Vertical Cavity Surface Emitting Lasers from All‐Inorganic Perovskite Nanocrystals

Wang

Nalla

et al. 2017

Adv Funct Materials

266

269

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Recently, newly engineered all‐inorganic cesium lead halide perovskite nanocrystals (IPNCs) (CsPbX3, X = Cl, Br, I) are discovered to possess superior optical gain properties appealing for solution‐processed cost‐effective lasers. Yet, the potential of such materials has not been exploited for practical laser devices, rendering the prospect as laser media elusive. Herein, the challenging but practically desirable vertical cavity surface emitting lasers (VCSELs) based on the CsPbX3 IPNCs, featuring low threshold (9 µJ cm−2), directional output (beam divergence of ≈3.6°), and favorable stability, are realized for the first time. Notably, the lasing wavelength can be tuned across the red, green, and blue region maintaining comparable thresholds, which is promising in developing single‐source‐pumped full‐color visible lasers. It is fully demonstrated that the characteristics of the VCSELs can be versatilely engineered by independent adjustment of the cavity and solution‐processable nanocrystals. The results unambiguously reveal the feasibility of the emerging CsPbX3 IPNCs as practical laser media and represent a significant leap toward CsPbX3 IPNC‐based laser devices.

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Single-Nanowire Single-Mode Laser

Cited by 212 publications

References 41 publications

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

Periodic Organic–Inorganic Halide Perovskite Microplatelet Arrays on Silicon Substrates for Room‐Temperature Lasing

Structural Coloring in Large Scale Core–Shell Nanowires

Solution‐Processed Low Threshold Vertical Cavity Surface Emitting Lasers from All‐Inorganic Perovskite Nanocrystals

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