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We demonstrate stimulated polariton emission at room temperature in a dielectric microcavity embedded with ZnO nanoparticles. The polariton lifetime is also shown to decrease drastically above the stimulated emission threshold.
The scintillation yield of rare-earth doped LaF3 nanoparticles (NPs) was experimentally measured. Taken together with evidence of FRET between NPs and covalently bound photosensitizer molecules, this suggests a route to combine radiation and photodynamic therapy.
Using an optofluidic chip with an integrated nanopore, a mixture of nanobeads and influenza viruses were opto-electrically detected. Different types of nanoparticles can be distinguished by different fluorescence wavelengths and fluorescence correlation functions.
We report optical trapping of 60 nm Au nanoparticles using photonic crystal slot-cavities with Q's of ∼7200 and 0.3mW of guided power at 1.6µm. Histograms of the cavity transmission are used to quantitatively analyze the trapping dynamics by modeling the back-action of the nanoparticles in the trap.
The temperature of absorbing particles changes under external illumination. In turn, this temperature distribution modifies the viscosity properties of the surrounding fluid leading to nonstationary dynamics and to ultra-fast optically induced motion of particles.
We report on the electromagnetic properties of the single-cycle “flying doughnut” electromagnetic permutations in the context of their interactions with nanoscale objects, such as dielectric and plasmonic nanoparticles.
Hydrophobic and oleophobic surfaces have been used to deliver molecules and nanoparticles in given 2D arrays with spatial control. Effectiveness in sensing and assembly processes is shown, reaching ultra low sensitivity (aM) and precise positioning of colloidal nanocrystals.
We demonstrate a label-free biosensor imaging approach that utilizes a photonic-crystal surface to detect attachment of individual nanoparticles down to ∼65×30×30nm3. Matching nanoparticle plasmon resonant-frequency to the photonic-crystal resonance substantially increases sensitivity of the approach.
We use thermophoresis to accumulate and quantify biomolecules under a laser-induced temperature gradient. As biomolecules accumulate at the heated region, the concentration of the molecules can be determined based on the level of accumulation.
We develop a near-field based optical trapping and conveyor belt system based on a novel plasmonic structure: C-shaped engraving. Using polarization rotation and wavelength switching, we demonstrate controlled transport of nanoparticles along different paths.
Using surface-enhanced Raman spectroscopy on gold-nanoparticle-decorated silicon nitride chips, we monitor the release of dextran-rhodamin molecules from capsules inside living cells. This demonstrates the feasibility of using photonic chips for intracellular sensing at visible wavelengths.
Fast electron based spectroscopies are often loosely compared to light scattering. By performing Electron Energy Loss Spectroscopy and Cathodoluminescence on single metallic nanoobjects, we show that these techniques are nanometric probes of extinction and scattering.
Silicon nanodisks support both electric and magnetic resonances, which can be tuned independently via their geometry. We utilize these engineered resonances and demonstrate dielectric metasurfaces for efficient shaping of the emission spectra of quantum dots.
We theoretically compare surface- and volume-based photoelectron emission from spherical nanoparticles, obtaining analytical expressions for the emission rate in both mechanisms. We show that the surface mechanism prevails, being unaffected by detrimental hot electron collisions.
Titanium nitride nanoparticles exhibit plasmonic resonances in the biological transparency window where high absorption efficiencies can be obtained with small dimensions. Both lithographic and colloidal samples are examined from the perspective of nanoparticle thermal therapy.
Integrating AFM technology into an SEM enables the interactive assembling of individual nanoparticles by in-situ pick-and-place handling. We present a hardware setup and introduce examples for the nanofabrication of plasmonic patterns.
We create a transparent display by projecting monochromatic images onto a polymer film embedded with nanoparticles that selectively scatter light at the projected wavelength. This approach features simplicity, wide viewing angle, scalability, and low cost.
Strong-field photoemission from plasmonic nanoparticles is demonstrated on the surface of a chip under ambient conditions. The photoemission shows a carrier-envelope phase-sensitive component with a 27 dB signal-to-noise ratio at a 0.78 Hz resolution bandwidth.
We measure near-field distributions of Mie-type optical modes of silicon nanodisks using apertureless near-field optical microscopy. Excellent agreement with numerical predictions is obtained, further enabling multipole analysis of the observed modes.
We demonstrate the detection and sizing of single nanoparticles in aqueous environment by real-time monitoring the step changes in the nanofiber transmission.
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