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A compact sensor for physically sorting bio-aerosols based on fluorescence spectra excited using UV-LED arrays is presented. The optical system integrates electronics for real-time processing of spectral data and a miniaturized aerodynamic deflector for particle separation.
We describe a principal component analysis (PCA) of bio-aerosols which incorporates both fluorescence excitation-emission data over the excitation range 210 nm - 600 nm and lifetime data. The analysis suggests a useful separation metric based on spectral angle.
Results for ARLpsilas breadboard chirped AM ladar using gain modulation of a short wavelength infrared band electron-bombarded active pixel sensor developed for 3D imaging and range-Doppler tracking first reported on last year are updated.
We report the observation of coherent phonon oscillations of radial breathing modes in insolated single-wall carbon nanotubes in suspension. Resonantly-excited radial breathing modes are analyzed to give us a new tool for chirality assignments, complimentary to photoluminescence and CW Raman spectroscopies.
ldquoZero-meanrdquo optical potentials are used to manipulate dephasing of ultra-cold atoms confined in atom-optical billiards. Generic and non-generic perturbations result in qualitatively different dephasing properties. Different phase-space regimes are probed and identified.
We exploit both the high nonlinearity and holey structure of microstructured fibers to combine an ultra-broadband light source and a gas cell in a single microstructured fiber filled with acetylene.
A membrane photonic crystal cavity coupled to a waveguide is fabricated and characterised. Fabry-Perot method was used to measure propagation losses. We show that coupling results in asymmetric features in the transmission suitable for high-speed analog modulation.
We report on a superresolution image enhancement technique that can improve the spatial resolution of digital photomicrography employing typical pixelated image sensors. A bulk-micromachined micromirror is used to control the image location with subpixel accuracy.
We investigate the impact of laser source coherence time on bit error rate (BER) and autocorrelation function performances of a direct sequence OCDMA system. Congruence codes are suggested to reduce the observed coherence effects.
We propose a new sensing method based on two quantum entangled beams. The effects caused by inserting polarizer or DNA solution into one beam can be also detected in the other undisturbed entangled beam.
A balanced optical-RF phase detector for the extraction of low-jitter RF-signals from optical pulse trains, which is robust against drifts and photodetector nonlinearities, is presented. Sub-10 fs in-loop relative timing jitter is demonstrated.
Control of the carrier-envelope phase by a composite glass plate is demonstrated without changing chirp or energy of the transmitted pulses. The effect is verified intracavity employing an octave-spanning laser and external with an autocorrelator.
A simple optical arrangement for phase sensitive detection of DFWM to characterize the real and imaginary parts of chi(3) is demonstrated. A processable polyacetylene sample is characterized at a wavelength of 1.5 mu(3)m using this technique.
A simple non-iterative electric field retrieval method using a sinusoidally driven optical phase modulator is proposed. The method is validated by demonstrating accurate characterization of picosecond pulses used in telecommunication.
We demonstrate line-by-line pulse shaping control for optical arbitrary waveform generation (O-AWG). Independent manipulation of individual spectral lines from a mode-locked frequency comb leads to synthesis of user-specified ultrafast optical waveforms with unprecedented frequency resolution.
We demonstrate an ultrasimple, extremely broadband, alignment-free, and single-shot Transient-Grating Frequency-Resolved-Optical-Gating device using a mask to separate the input beam into three beams and a Fresnel biprism to cross and delay them.
Current challenges in CARS microscopy lie in pushing the sensitivity limit, together with designing turnkey set-ups based on high power, broadly tunable lasers. We have moved one step forward in each of these two directions.
We describe a tomographic Hartmann sensor with sensitivity of lambda/1100 that can measure optical distortions in gravitational wave interferometers. Using an off-axis geometry we demonstrate reconstruction of on-axis optical distortions to a precision of lambda/100.
We demonstrate 3D imaging using a planar dielectric system based on strongly anisotropic dielectric material. The proposed planar dielectric lens is capable of subwavelength resolution and does not rely on either magnetic response or periodic patterning.
By combining electron diffraction with Rayleigh scattering spectroscopy, we determine the physical structure and optical transition energies of individual single-walled carbon nanotubes. This permits study of the energy-level structure as a function of nanotube chirality.
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