Optical attenuation coefficient in individual ZnO nanowires

Little, Anree G; Hoffman, Abigail; Haegel, N. M.

doi:10.1364/oe.21.006321

Cited by 8 publications

(6 citation statements)

References 17 publications

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“…A summary of the emissive properties for ZnO NW-in-fibers is reported in Table S1 in the Published in ACS Nano, doi: 10.1021/acsnano.0c00870 (2020). 19 hybrid material, make NW-in-fibers excellent and versatile active media for flexible UV lasers that can be coupled with curved optical components or integrated in miniaturized diagnostics and microfluidic devices.…”

Section: Resultsmentioning

confidence: 99%

“…Hybrid approaches, inserting highly-efficient and stable oxide nanosystems in flexible polymer nanostructures and enabling high throughput processing, would combine advantages of UV lightemitting inorganics and plastic matrices, and potentially lead to materials with enhanced properties. For instance, in these systems light from UV nanoscale emitters could be efficiently coupled to polymer waveguides and transported along macroscale distances, 3,18 thus overcoming the high propagation losses typical of individual inorganic nanostructures 19 and enabling a much Published in ACS Nano, doi: 10.1021/acsnano.0c00870 (2020). 4 more versatile device interfacing.…”

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confidence: 99%

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Conformable Nanowire-in-Nanofiber Hybrids for Low-Threshold Optical Gain in the Ultraviolet

et al. 2020

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The miniaturization of diagnostic devices that exploit optical detection schemes requires the design of light-sources combining small size, high performance for effective excitation of chromophores, and mechanical flexibility for easy coupling to components with complex and non-planar shapes. Here, ZnO nanowire-in-fiber hybrids with internal architectural order are introduced, exhibiting a combination of polarized stimulated emission, low propagation losses of light modes, and structural flexibility. Ultrafast transient absorption experiments on the electrospun material show optical gain which gives rise to amplified spontaneous emission, with threshold lower than the value found in films. These systems are highly flexible and can conveniently conform to curved surfaces, which makes them appealing active elements for various device platforms, such as bendable lasers, optical networks and sensors, as well as for application in bioimaging, photo-crosslinking, and optogenetics.The development of miniaturized and effective light sources with emission in the near ultraviolet (UV) is highly important for all those fields, including microanalysis through fluorescence spectroscopy, chemical sensing, and healthcare diagnostics, where molecular photoexcitation is involved. 1-4 Together with mechanical flexibility to have them conformed to different surfaces or lodged within different lab-on-chip platforms, 2,3,5,6 UV-active materials are desired to feature stimulated emission and optical gain, which is the basic prerequisite to use them in compact laser systems and photonic networks. Examples of UV-emitters include various inorganics (GaN, ZnS, ZnO, etc.) and their nanostructures grown through chemical vapour transport processes, colloidal synthesis, and other deposition methods. 7-12 Inorganic nanostructures, and especially nanowires (NWs), have been largely exploited within semiconductor-embedding optical cavities, plasmonic nanolasers, and heterojunctions. 7,9,12,13 However, the so-obtained devices are largely limited to planar systems or substrates for nanostructure growth, they are mechanically stiff, and unconformable to curved surfaces.Polymeric light-emitting materials and films, 3,14-17 instead, can be easily coupled with bendable substrates and are more versatile in terms of configurational motifs, although their optical performance and stimulated emission properties are generally much less appealing and stable in time compared to inorganics.Hybrid approaches, inserting highly-efficient and stable oxide nanosystems in flexible polymer nanostructures and enabling high throughput processing, would combine advantages of UV lightemitting inorganics and plastic matrices, and potentially lead to materials with enhanced properties. For instance, in these systems light from UV nanoscale emitters could be efficiently coupled to polymer waveguides and transported along macroscale distances, 3,18 thus overcoming the high propagation losses typical of individual inorganic nanostructures 19 and enabling a much Published i...

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Conformable Nanowire-in-Nanofiber Hybrids for Low-Threshold Optical Gain in the Ultraviolet

et al. 2020

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“…Thus, an immediate improvement in this limitation of SPM technology is seen in Figure 4 where one is able to zoom into a specific ZnO nanowire from a field of 600 μm to 40 μm. This has recently allowed the measurement of the optical attenuation coefficient of a particular ZnO nanowire using the near-field optical capability of this hybrid technology [9].…”

Section: Resultsmentioning

confidence: 99%

AFM Integrated with SEM and FIB: A Synergistic Union

et al. 2013

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Scanning electron microscopy (SEM) and ion beam milling techniques are mature nanoscale measurement technologies, whereas atomic force microscopy (AFM) is a developing technology generating intense interest in the scientific community for basic research and development. These techniques have generally existed in separate worlds. This article discusses a capability that marries these technologies through an instrument recently introduced by Nanonics, the 3TB4000.

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“…Emission has been detected for waveguiding at distances up to 60 μm. By measuring the intensity as a function of distance, a Beer's law analysis has been performed, allowing effective attenuation coefficients to be measured as a function of nanowire diameter [43]. This type of approach could be applied to measure localized absorption/transmission across boundaries, defects or interfaces, or within very small structures designed for the local control and transport of light.…”

Section: Transport Imagingmentioning

confidence: 99%

Integrating electron and near-field optics: dual vision for the nanoworld

Haegel

2014

Nanophotonics

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Abstract:The integration of near-field scanning optical microscopy (NSOM) with the imaging and localized excitation capabilities of electrons in a scanning electron microscope (SEM) offers new capabilities for the observation of highly resolved transport phenomena in the areas of electronic and optical materials characterization, semiconductor nanodevices, plasmonics and integrated nanophotonics. While combined capabilities for atomic force microscopy (AFM) and SEM are of obvious interest to provide localized surface topography in concert with the ease and large spatial dynamic range of SEM and dual beam imaging (e.g., in-situ AFM following focused ion beam modification), integration with near-field optical imaging capability can also provide access to localized transport phenomena beyond the reach of far-field systems. In particular, the flexibility that is achieved with the capability for independent, high resolution placement of an electron source, providing localized excitation in the form of free carriers, photons or plasmons, with scanning of the optical collecting tip allows for unique types of "dual-probe" experiments that directly image energy transfer. We review integrated near-field and electron optics systems to date, highlight applications in a variety of fields and suggest future directions.

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Optical attenuation coefficient in individual ZnO nanowires

Cited by 8 publications

References 17 publications

Conformable Nanowire-in-Nanofiber Hybrids for Low-Threshold Optical Gain in the Ultraviolet

Conformable Nanowire-in-Nanofiber Hybrids for Low-Threshold Optical Gain in the Ultraviolet

AFM Integrated with SEM and FIB: A Synergistic Union

Integrating electron and near-field optics: dual vision for the nanoworld

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