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We present a theoretical assessment of two open-path quantum cascade laser (QCL) approaches (mono/bi-static and backscatter) to measure ambient ozone and ammonia concentrations to within 1-10% accuracy at distances up to 10 km.
Experiments and simulation demonstrate an instability of the intracavity pumped optical parametric oscillator against bidirectional operation. It is shown that nonlinear losses inside the signal cavity can stabilize the bidirectional operation.
The momentum transfer to a scatterer from Raman photons was detected using an optical system that permits one to simultaneously measure the radiation forces exerted on, and the Raman emission from the scatterer.
We present an imaging method that maps a 2D image into a serial time-domain waveform and simultaneously amplifies it optically. Continuous real-time images at a record frame rate of 6.1 MHz are captured using an oscilloscope.
We have used terahertz time-domain spectroscopy to investigate carrier dynamics in a wide range of semiconductors. The technique allows discriminating between free charges and excitons and is perfectly suitable to study carrier-carrier interactions in nanostructured materials.
We experimentally demonstrate a picogram-scale optomechanical system that increases its mechanical rigidity by more than 5times with the application of mW-level optical power. We discuss the theory and fabrication, making comparisons to existing optomechanical systems.
We use dual-quadrature spectral interferometry to demonstrate single shot amplitude and phase retrieval of shaped waveforms generated from a 10 GHz optical frequency comb and switched at the repetition rate of the frequency comb.
We present the theory and experimental realization of simultaneously localized and strongly coupled optical and mechanical modes in periodic nanostructures. The mechanical properties of localized phonons with Gigahertz frequencies and sub-picogram masses are studied via all-optical measurements.
The spin of an electron in an InAs/GaAs quantum-dot molecule is optically prepared and nondestructively measured through trion-triplet states. With two-laser transmission spectroscopy we demonstrate both simultaneously, something not previously accomplished in single quantum dots.
We describe an optical network-on-chip built from passive wavelength routing circuits and tunable micro transmitters based on microdisk sources. Operation of the different subcomponents will be demonstrated.
A new cavity-optomechanical system has been developed comprised of two doubly-clamped silicon nitride cantilevers with a 1D photonic crystal etched into them. We will discuss the optical properties of the system and potential applications to solid-state cavity QED with diamond color centers.
We report break-up of cylindrical shell into well-ordered filament arrays by optical-fiber thermal drawing. Enhanced photosensitivity of centimeter-long crystalline-Se nano-filaments is observed and the mechanism is discussed. This work paves a way to in-fiber nanodevices.
A one-dimensional photonic crystal structure in a total-internal-reflection geometry has been developed for real-time, label-free specific protein binding detection. With the streptavidin-biotin system, an ultra low mass density detection limit 24 fg/mm2 was achieved.
Four-wave mixing in semiconductor quantum wells has long been used to investigate many-particle effects. We introduce the theoretical concepts and illustrate some developments of the field, which D.S. Chemla helped to shape.
Phase to frequency conversion is demonstrated with a synchronously modelocked optical parametric oscillator, with a sensitivity of 16 MHz/radian, and a phase resolution of 9ldr10-8 radian.
Studies are presented that combine optical and THz excitation in the linear and nonlinear regimes. The analysis focuses on exciton formation and decay, the plasmonic response, THz gain, excitonic Rabi flopping, and quantum-state control.
An exposed Bragg grating incorporated into a planar waveguide was used to form a refractive index sensor. The high sensitivity to subtle changes allowed the study of surface functionalisation and binding within a microfluidic system.
We report pronounced light-induced change of the optical activity at terahertz frequency in metal chiral gratings on semiconductor substrates. This result opens new horizons in the active terahertz polarization control.
We present results demonstrating the excitation of surface phonon-polaritons at the interface between SiC and different materials. The resonant nature of the excitation can be used to sense minute substance amounts or distinguish between substances.
For CO2 differential-absorption LIDAR, the single-mode output of a type-II PPLN entangled-cavity nanosecond doubly-resonant OPO emitting at 2.05 mum is amplified to 11 mJ, with 3 MHz rms frequency stability and a M2 < 1.9.
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