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We propose a nano-laser utilizing a cylindrical bowtie cavity. The low threshold current and nanometer-scale confinement of the lasing mode are achievable due to the field enhancement from plasmonic and curvature effects of bowtie tips.
We characterize heat transport in nanostructures, using coherent soft-X-rays to probe thermal surface deformation. By varying the substrate temperature, we observe the transition from diffusive to quasi-ballistic heat transport regimes.
The ultrafast buildup of optically induced stress in ferromagnetic nanolayers of a SrRuO3/SrTiO3 superlattice is analyzed by femtosecond X-ray diffraction. Below the Curie temperature, magnetoelastic contractive stress reduces the expansive anharmonic phonon stress.
We give an overview of slow and fast light effects in semiconductor waveguides. Experimental and theoretical results are presented, emphasizing the physics as well as the limitations imposed by the carrier dynamical processes.
With femtosecond-pulse excitation, two- and three-photon absorption induced ultraviolet lasing with spectral linewidth 0.2-1 nm have been realized under very low excitation threshold from ZnO nanorod arrays at both room and liquid nitrogen temperatures.
The influence of accumulation effects on the creation of ldquonanogratingrdquo structures has been investigated. Furthermore, the plasma electron density has been measured with a spectral interferometry pump-probe technique.
Transferrin-conjugated gold nanorods were used for targeting, two-photon imaging and photothermal therapy of cancer cells. The presence of nanorods significantly reduced the laser power effective for therapy.
Positron emission tomography requires high-brightness fast-decay scintillators for coincidence counting of positron annihilation events. We demonstrate that LaF3:Ce nanocrystals show promising characteristics for that application. Scintillation response and photoluminescence lifetime below 27 ns are measured.
We fabricated photonic crystal nanocavities to enhance erbium (Er) emission in silicon rich nitride nanocrystals. We observed experimental quality factors of ~6000 and 20-fold enhancement, in agreement with numerical calculations of the Purcell effect.
Two-photon absorption induced photoluminescence of para-sexiphenyl nano-needles with high polarization and directional property was observed. The time-resolved measurement shows a very fast photoresponse and the absorption polarization selectivity of ground state.
Three-dimensionally nano-structured metal surfaces containing nano-scale voids produce strong localised plasmons. We show here the correlation between physical structure and photonic and electronic properties for several significant applications.
Micro-photoluminescence from GaN/InGAN multiple quantum wells embedded in a nano-pillar structure with a diameter of 300 nm is characterized. The emission spectrum shows a blue shift of 68.3 meV in energy due to strain relaxation.
Si-rich SiOx planar waveguide with Si nanocrystals contributed amplified spontaneous emission at 750-850 nm is characterized by variable stripe length method to demonstrate optical gain and loss coefficients of 60 and 16 cm-1, respectively.
We observe experimentally all-optical analogue to electromagnetically induced transparency with silicon photonic crystal nanocavities having high intrinsic quality factor and small modal volume. This phenomenon is analyzed through coupled-mode formalism and three-dimensional finite-difference time-domain method.
Blue and yellow electroluminescence of MOSLEDs made on Si-rich SiOx with buried Si nanocrystals of different sizes controlled with minimum hydrogen passivation are demonstrated by PECVD at different N2O/SiH4 ratio and total fluence.
We report a bright and color-saturated blue light-emitting-diode based on colloidal core/shell-CdS/ZnS quantum-dots. Broad-band, long-wavelength emission from the deep-traps in QDs is, for the first time, minimized to less than 5% of the total emission.
Angular and spectral reflectivities of GaN nano-pillar structures are investigated for heights of 350 nm, 550 nm and 720 nm. Calculations based on rigorous coupled-wave analysis show excellent agreement with the measured reflectivities for s- and p-polarizations.
We report novel single-crystalline (In)GaAs nanoneedles with 2~5 nm tips, smooth 6-9deg taper angles and lengths up to 3-4 mum, grown aligned to [111] orientation on Si substrates. Bright photoluminescence is obtained from quantum-well nanoneedles.
We design, fabricate and demonstrate a hybrid nanocrystal/patterned p-i-n device that utilises fluorescence energy transfer and exhibits a three-fold increase of the measured photocurrent compared to its bare p-i-n counterpart.
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