The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
For controlling non-resonant molecular fragmentation process, simultaneous effect of chirp and polarization of a femtosecond pulse is mutually independent. For multiphoton fluorescence microscopy and optical tweezers with high-repetition-rate lasers, inter-pulse separation and polarization is important.
We describe high-brightness, broad area midinfrared semiconductor lasers. The laser structures incorporated 14 type-II quantum wells imbedded in thick waveguide/absorber regions composed of InGaAsSb. The optically pumped devices achieved higher brightness operation as unstable facets. For a 4 mm UR operating at λ=4.7µm and at 35 x threshold the device was observed to be diffraction limited. In comparison...
We demonstrate an all-THz fiber-based swept-source imaging radar system. Our experiment shows that this radar can be used in real time to nondestructively detect and locate the concealed living objects with high stability and sensitivity.
We achieved a 100-fold improvement in tip-sample stability by stabilizing the tip and the sample in 3D using laser light back-scattered off the apex of an AFM tip and a reference mark in the sample.
We have developed a novel high-resolution molecular imaging technique, Pump-Probe Optical Coherence Microscopy, based on the fusion of Pump-Probe spectroscopy and Optical Coherence Microscopy and demonstrated it on fixed human skin containing a nodular melanoma.
Aortic valve samples, classified into normal, mild, moderate and severe fibrous calcific tissue based on Raman Spectroscopy, were analyzed with Optical Coherence Tomography. Results point OCT as a powerful diagnostic tool for aortic valve stenosis.
Few-fermion dynamics in a single CdSe/ZnSe quantum dot after resonant excitation is investigated via femtosecond transmission spectroscopy. Optimized coupling via dielectric microcavities and plasmonic nanoantennas is discussed leading towards ultrafast nonlinear optics with single photons.
Second and Third harmonic imaging were investigated to observe a corneal flap created by an ophthalmic knife or a microkeratome as it can be processed during a LASIK surgery.
We demonstrate ultrafast transistor-based photodetectors made from single- and few-layer graphene. The photoresponse does not degrade for optical intensity modulations up to 40 GHz, and further analysis suggests that the intrinsic bandwidth may exceed 500 GHz.
We fabricated three-dimensional arrays of optical Yagi-Uda nano-antennas. Due to the high directivity of the array structure the incoming light is received efficiently at the resonant wavelength in the near-infrared (around λ = 1.3 μm).
We present a class of devices called Asymmetric Bowtie nano-Colorsorters. These devices have specifically engineered symmetries enabling them to capture, confine, spectrally filter and steer optical fields while maintaining nanoscale field distributions.
We demonstrate enhanced resolution in image detection by phase-sensitive preamplification. In one-versus-two-target experiment we distinguish otherwise unresolved images with higher probability after such amplification than is possible without amplification.
We demonstrate experimental results and analytical formulation of slow-light-enhanced self-phase modulation limited only by three-photon absorption. We present nonlinear figure-of-merits on three-photon-limited ultrafast switching, and critical intensities for free-carrier effects in photonic crystals.
We report on a femtosecond-OPO based multimodal nonlinear optical microscope that permits multiphoton fluorescence, SHG, THG, CARS, and stimulated Raman scattering imaging on the same platform.
We study the chiral optical properties of three-dimensional photonic superlattices composed of polymeric helices in various spatial checkerboard-like configurations. We fabricate and characterize four arrangements of circular-spiral photonic crystals with different relative phase and handedness.
We demonstrate a fully integrated optomechanical transducer achieving 580 ppm wavelength tuning of a high quality factor (Q=105–106) waveguide-coupled silicon microdisk by electrostatically actuating a dielectric membrane located in the evanescent field region above it.
We demonstrate two-photon interference using two remote organic molecules as bright solid-state sources of indistinguishable photons. By varying the transition frequency and spectral width of one molecule, we explore the effect of photon distinguishability.
Based on a systematic analysis of the symmetry properties of metamaterial unit cells, we show experimentally and theoretically that asymmetric transmission for linearly polarized, visible light can be observed for suitably designed unit cells.
Anisotropic metamaterial made of nanowire array can realize negative refraction of light even without a negative phase index of refraction. Using this material, we were able to achieve lensing action with micron-thick slab and demonstrate imaging of a slit object. The details of the focused light beam in 3-dimensional space have been mapped with NSOM.
We demonstrate a 25 Gb/s error-free operation of a directly modulated holey VCSEL, and the data rate can be extended to above 30 Gb/s when the VCSEL substrate temperature is stabilized by a thermoelectric cooler.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.