Picosecond on-off switching using a pair of picosecond-on/nanosecond-off GaAs étalons

Lowry, C. W.; Gibbs, H. M.; Pon, R.; Khitrova, G.

doi:10.1063/1.104108

Cited by 11 publications

(4 citation statements)

References 7 publications

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“…This behavior is consistent with the recent observation of strongly delocalized π plasmons along the tube axis in multiwalled BNNTs as studied by other research reports . The ultrafast decay time in picoseconds suggest that these BNNTs can be used for many optical sensor and fast optical switching applications …”

Section: Resultssupporting

confidence: 92%

“…40 The ultrafast decay time in picoseconds suggest that these BNNTs can be used for many optical sensor and fast optical switching applications. 41 Magnetic Behavior and Tracking. Room-temperature magnetization measurements were carried out using a superconducting quantum interference device (SQUID) magnetometer and the results M−H curve are shown in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

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Probing of Ni-Encapsulated Ferromagnetic Boron Nitride Nanotubes by Time-Resolved and Steady-State Photoluminescence Spectroscopy

Reddy

Narayanan

Martí³

et al. 2012

J. Phys. Chem. C

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Here we report the synthesis of multifunctional Ni-encapsulated boron nitride nanotubes (BNNTs), with average diameter and length measuring ∼30 nm and ∼25 μm, by a facile ball-milling−chemical vapor deposition route. The resulting BNNTs exhibit an intense blue emission peaking at ∼480 nm upon ∼365 nm excitation, and the time-resolved emission spectroscopy shows a photoluminescence decay lifetime of picoseconds. The SQUID magnetization measurements show an enhanced coercivity of 140 Oe. Obtained collective optical and magnetic properties of BNNT suggest that it could be an exceptional choice for future optomagnetic-based sensor devices, biomedical therapy, and bioimaging applications.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Probing of Ni-Encapsulated Ferromagnetic Boron Nitride Nanotubes by Time-Resolved and Steady-State Photoluminescence Spectroscopy

Reddy

Narayanan

Martí³

et al. 2012

J. Phys. Chem. C

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show abstract

“…It is well-known that optical switches or optical sensors require the decay time to be in the nanosecond to picosecond range, which legitimates our TRPL spectroscopic results. 63…”

Section: Resultsmentioning

confidence: 99%

Time-resolved and photoluminescence spectroscopy of θ-Al₂O₃nanowires for promising fast optical sensor applications

et al. 2014

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Herein, we have demonstrated the high yield facile growth of Al2O3 nanowires of uniform morphology with different polymorph phases (e.g. γ, δ and θ) via a hydrothermal method with varying calcination temperatures. The synthesized θ-Al2O3 nanowires were well characterized by XRD, FTIR, SEM/EDAX, AFM and HRTEM techniques. Microstructural analysis confirmed that the dimensions of the individual θ-Al2O3 nanowires are approximately in the ranges 5-20 nm in width and 40-150 nm in length, and the aspect ratio is up to 20. AFM results evidenced the uniform distribution of the nanowires with controlled morphology. Furthermore, UV-vis spectroscopic data reveal that the estimated optical band gap of the θ-Al2O3 nanowires was ~5.16 eV. The photoluminescence spectrum exhibits blue emission upon excitation at a wavelength of 252 nm. Time-resolved spectroscopy demonstrates that these nanowires illustrate a decay time of ~2.23 nanoseconds. The obtained photoluminescence results with a decay time of nanoseconds suggest that the θ-Al2O3 phase could be an exceptional choice for next generation fast optical sensors.

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“…Moreover, with the development of optical bistable devices accessible with laser diodes, the way opened to conceive of applications in optical computing, switching and image processing. Faster devices can be accomplished by introducing surface recombination [129], proton implantation, and/or by using a second etalon in series to switch off the first [130], which enable switching speeds of 30-40 picoseconds.…”

Section: Application Of Optical Bistabilitymentioning

confidence: 99%

Optical bistability in mesoporous silicon microcavity resonators

Pham

Qiao

Guan

et al. 2011

Journal of Applied Physics

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Porous silicon (PSi) has been shown to be a material with varieties of nonlinear optical properties. These properties have been discussed in terms of its nature of photoluminescence mechanism such as quantum confinement, surface states and the role of impurities. PSi has also been shown to be a useful material for optical devices, and have potential applications in fields such as bio-sensing and efficient lighting. In the following thesis, I present my theoretical and experimental results in studying a nonlinear optical property, known as optical bistability, in mesoporous silicon microcavity devices. The results show significant optical hysteresis in the transmission and reflection properties of mesoporous silicon microcavities when illuminated with a 150 nanosecond pulsed laser at 532 nm. The optical hysteresis is shown to be transient in nature and the properties are strongly dependent on the porosity of the cavity layer. The onset and damage threshold intensity are also shown to be porosity dependent. Modeling suggests that the observed effects are due to changes in the nonlinear refractive index and the transient lifetime increases with increasing porosity. The role of surface states was also investigated on influencing the bistable process by passivating the internal porous surface with hydrosilylation chemistry. The role of the number of periods in the cavity structure is also studied. The cavity is doped with quantum dot to improve its switching intensity. The optical bistable property of the cavity was also investigated by using a 532 nm continuous wave (CW) laser with maximum power of 10 mW, modulated by an optical chopper. The only sample that yields significant hysteresis is the sample doped with quantum dot, with millisecond respone time. The results show that the sample doped with quantum dot shows both electronic and thermal process in forming optical hysteresis. Finally, I develop a theoretical model to study the transient hysteresis shape. The model suggests that the power and pulse width of the excitation laser source strongly influence the shaping of the bistable curves. The nature of the nonlinear refractive index is also quantified in terms of the power and the width of the excitation pulse. The third order nonlinear coefficient is calculated to be in the order of 10-10 esu while the passivated samples yield results in the order of 10-9 esu, which agree with previous findings in literature.

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Picosecond on-off switching using a pair of picosecond-on/nanosecond-off GaAs étalons

Cited by 11 publications

References 7 publications

Probing of Ni-Encapsulated Ferromagnetic Boron Nitride Nanotubes by Time-Resolved and Steady-State Photoluminescence Spectroscopy

Probing of Ni-Encapsulated Ferromagnetic Boron Nitride Nanotubes by Time-Resolved and Steady-State Photoluminescence Spectroscopy

Time-resolved and photoluminescence spectroscopy of θ-Al₂O₃nanowires for promising fast optical sensor applications

Optical bistability in mesoporous silicon microcavity resonators

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Picosecond on-off switching using a pair of picosecond-on/nanosecond-off GaAs étalons

Cited by 11 publications

References 7 publications

Probing of Ni-Encapsulated Ferromagnetic Boron Nitride Nanotubes by Time-Resolved and Steady-State Photoluminescence Spectroscopy

Probing of Ni-Encapsulated Ferromagnetic Boron Nitride Nanotubes by Time-Resolved and Steady-State Photoluminescence Spectroscopy

Time-resolved and photoluminescence spectroscopy of θ-Al2O3nanowires for promising fast optical sensor applications

Optical bistability in mesoporous silicon microcavity resonators

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Product

Resources

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Time-resolved and photoluminescence spectroscopy of θ-Al₂O₃nanowires for promising fast optical sensor applications