Extreme electronic bandgap modification in laser-crystallized silicon optical fibres

Healy, Noel; Mailis, S.; Bulgakova, Nadezhda M.; Sazio, Pier J. A.; Day, Todd D.; Sparks, Justin R.; Cheng, Hiu Yan; Badding, John V.; Peacock, Anna C.

doi:10.1038/nmat4098

Cited by 103 publications

(87 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 2(c) shows the peak position, scanning from the as-drawn to annealed core regions. While the strain induced shifts are significantly smaller than those observed for annealed silicon-core glass fibers [28], the data supports the observation [29] that controlled cooling rate can alter the residual strain in crystalline core fibers.…”

Section: Electron Microscopysupporting

confidence: 83%

“…There are also reports on both SiGe alloy and II-VI core fibers [18][19][20][21][22][23], one including low temperature photoluminescence [21]. However, there is limited information on III-V semiconductor-core fibers [26][27][28] manufactured by either CVD or molten-core techniques. InSb [24] and GaSb [25] fibers have been drawn using the molten-core approach, with crystallographic and compositional properties reported.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Crystalline GaSb-core optical fibers with room-temperature photoluminescence

Song

Healy

Svendsen

et al. 2018

Opt. Mater. Express

View full text Add to dashboard Cite

Glass-clad, GaSb-core fibers were drawn and subsequently laser annealed. The asdrawn fibers were found to be polycrystalline, possess Sb inclusions, and have oxide contamination concentrations of less than 3 at%. Melting and resolidifying regions in the cores using 10.6 µm CO 2 laser radiation yielded single crystalline zones with enhanced photoluminescence (PL), including the first observation of strong room temperature PL from a crystalline core fiber. Annealed fibers show low values of tensile strain and a bandgap close to that of bulk GaSb.

show abstract

Section: Electron Microscopysupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Crystalline GaSb-core optical fibers with room-temperature photoluminescence

Song

Healy

Svendsen

et al. 2018

Opt. Mater. Express

View full text Add to dashboard Cite

show abstract

“…The stresses developing from the anomalous expansion may constitute an interesting way to control the materials bandgap (12,40). In addition, the Janus particles produced by slowly cooling SiGe droplets represent a main finding, with potential applications in components of traditional radio frequency circuitry or in quantum computing, if successfully scaled down to nanometric regime, which was shown to be potentially possible elsewhere (13)(14)(15).…”

Section: Discussionmentioning

confidence: 99%

Confined in-fiber solidification and structural control of silicon and silicon−germanium microparticles

Gumennik

Levy

Grena

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

Crystallization of microdroplets of molten alloys could, in principle, present a number of possible morphological outcomes, depending on the symmetry of the propagating solidification front and its velocity, such as axial or spherically symmetric species segregation. However, because of thermal or constitutional supercooling, resulting droplets often only display dendritic morphologies. Here we report on the crystallization of alloyed droplets of controlled micrometer dimensions comprising silicon and germanium, leading to a number of surprising outcomes. We first produce an array of silicon−germanium particles embedded in silica, through capillary breakup of an alloy-core silica-cladding fiber. Heating and subsequent controlled cooling of individual particles with a two-wavelength laser setup allows us to realize two different morphologies, the first being a silicon−germanium compositionally segregated Janus particle oriented with respect to the illumination axis and the second being a sphere made of dendrites of germanium in silicon. Gigapascal-level compressive stresses are measured within pure silicon solidified in silica as a direct consequence of volume-constrained solidification of a material undergoing anomalous expansion. The ability to generate microspheres with controlled morphology and unusual stresses could pave the way toward advanced integrated in-fiber electronic or optoelectronic devices. multimaterial fibers | microparticles | confined solidification | silicon−germanium spheres | stressed silicon C ontrolling the microstructure or state of stress of microparticles and nanoparticles is often key to attaining the desired properties for a specific application (1-5); however, the ability to do so is strongly limited by the synthesis method. For instance, nonspherically symmetric distributions of inorganic materials are difficult to achieve from bottom-up approaches (4-7). Likewise, controlling the state of stress or strain of semiconductor particles is challenging in unconstrained nucleation-and-growth synthesis methods. However, Janus particles of silicon−germanium (SiGe) could potentially find applications as microswimmers or nanoswimmers owing to asymmetric absorption properties (8), as well as in infrared photodetectors or solar cells for increased infrared absorption (9). Stressed silicon particles, on the other hand, could be used for bandgap tunability in photonic or optoelectronic devices (10-12).In the past few years, thermally drawn multimaterial fibers have emerged as a unique platform for top-down scalable fabrication of microparticles to nanoparticles over a broad range of materials, through controlled in-fiber capillary breakup of the fiber components (13-15). In the case of polymers or chalcogenide glasses, structural control of the particle can be achieved by constructing complex cores at the preform level, which is later broken up in the fiber state to form structured particles (13). However, in the case of traditional semiconductor materials such as silicon and germanium, the same...

show abstract

“…Science-relevant applications include, e.g., high harmonic generation [42], dielectric laser acceleration [43], or research in silicon modifications [44]. The mid-IR can be obtained by optical parametric generation (OPG) and amplification (OPA), where a powerful pump beam of the shortest wavelength generates signal and idler beams of longer wavelengths.…”

Section: Mid-ir Generationmentioning

confidence: 99%

Status of the High Average Power Diode-Pumped Solid State Laser Development at HiLASE

et al. 2015

View full text Add to dashboard Cite

An overview of the latest developments of kilowatt-level diode pumped solid state lasers for advanced applications at the HiLASE Centre is presented. An overview of subcontracted and in-house-developed laser beamlines is presented. The aim of development is to build kW-class beamlines delivering picosecond pulses between 1-and 100-kHz repetition rates and high-energy nanosecond pulses at 10 Hz. The picosecond beamlines are based on Yb:YAG thin-disk amplifiers and chirped pulse amplification. The current status of the beamlines' performance is reported. The advantages of zero-phonon line and pulsed OPEN ACCESS Appl. Sci. 2015, 5638 pumping are demonstrated with respect to efficiency, thin disk temperature and beam quality. New diagnostics methods supporting the high average power lasers' development, such as the high-resolution spectroscopy of Yb-doped materials, in situ thin disk deformation measurements, single-shot M 2 measurement, realization of wavefront correction by a deformable mirror and the laser performance of a new mixed garnet ceramics, are described. The energetic, thermal and fluid-mechanical numerical modeling for the optimization of the multi-slab amplifiers is also described.

show abstract

Extreme electronic bandgap modification in laser-crystallized silicon optical fibres

Cited by 103 publications

References 36 publications

Crystalline GaSb-core optical fibers with room-temperature photoluminescence

Crystalline GaSb-core optical fibers with room-temperature photoluminescence

Confined in-fiber solidification and structural control of silicon and silicon−germanium microparticles

Status of the High Average Power Diode-Pumped Solid State Laser Development at HiLASE

Contact Info

Product

Resources

About