Poster Session Program
... The national project of development of a 300GHz band folded waveguide traveling wave tube (FWG-TWT) for broad band communications has started last year. We will present the outline of the development program and summary design of the FWG-TWT. Major targets of the 300GHz FWG-TWT are the output power ...
... The national project of development of a 300GHz band folded waveguide traveling wave tube (FWG-TWT) for broad band communications has started last year. We will present the outline of the development program and summary design of the FWG-TWT. Major targets of the 300GHz FWG-TWT are the output power ...
POLITECNICO DI MILANO Polo Regionale di Lecco Faculty of
... duration can play significant effect on material laser beam interaction, and ultimately obtained product quality. The measuring technique used in this experimentation is off axis laser beam detection with fast responding photodiodes. The experimental approach is rigorous with two configurations used ...
... duration can play significant effect on material laser beam interaction, and ultimately obtained product quality. The measuring technique used in this experimentation is off axis laser beam detection with fast responding photodiodes. The experimental approach is rigorous with two configurations used ...
Nonlinear Optical Phenomena and Materials
... relied directly on the enormous increase of power spectral brightness provided by a laser source compared to incoherent sources. Power densities greater than ...
... relied directly on the enormous increase of power spectral brightness provided by a laser source compared to incoherent sources. Power densities greater than ...
Processing of Graphene combining Optical Detection and Scanning
... scratching [9]. For a proof-of-concept study, the latter one has been chosen as it can be applied using a simple unmodified AFM probe. Due to the working principle, this technique is also known as AFM-PlowLithography [11]. A scanning electron micrograph of the herein used AFM probe is shown in Figur ...
... scratching [9]. For a proof-of-concept study, the latter one has been chosen as it can be applied using a simple unmodified AFM probe. Due to the working principle, this technique is also known as AFM-PlowLithography [11]. A scanning electron micrograph of the herein used AFM probe is shown in Figur ...
Extreme pulse-front tilt from an etalon
... having a near-transform-limited duration of ⬃700 ps. To study the pulse after the etalon, we put a beam splitter at the output of the laser forming reference and unknown arms of the interferometer. The unknown beam passes through the first etalon (which we call the PFT etalon and with d = 5 mm) addin ...
... having a near-transform-limited duration of ⬃700 ps. To study the pulse after the etalon, we put a beam splitter at the output of the laser forming reference and unknown arms of the interferometer. The unknown beam passes through the first etalon (which we call the PFT etalon and with d = 5 mm) addin ...
Femtosecond Laser Pulses: Linear Properties
... example in medical diagnostics or - by taking the longitudinal frequency comb mode structure into account - for high precision optical frequency metrology. The latter is expected to outperform today’s state of the art caesium clocks and was rewarded with the 2005 Nobel price in physics for J.L. Hall ...
... example in medical diagnostics or - by taking the longitudinal frequency comb mode structure into account - for high precision optical frequency metrology. The latter is expected to outperform today’s state of the art caesium clocks and was rewarded with the 2005 Nobel price in physics for J.L. Hall ...
Optical Nonlinearities in the Transparency Region of Bulk Semiconductors . W
... generality, we assume that the measurement is performed on beam 1, while beam 2 acts as an excitation source only. The first terms on the right-hand side of the preceding equations correspond to self-action (ie., single-beam experiments). The second terms correspond to the case of an excite-probe ex ...
... generality, we assume that the measurement is performed on beam 1, while beam 2 acts as an excitation source only. The first terms on the right-hand side of the preceding equations correspond to self-action (ie., single-beam experiments). The second terms correspond to the case of an excite-probe ex ...
Adaptive Control of Ultrashort Laser Pulses for
... was introduced that works as a coherent source of light—from this time on, the properties of the light field could be controlled in a well-defined manner and were used as an instrumental tool of high precision. Only few decades later, in the era of photonics, ultrashort pulses of this laser light ha ...
... was introduced that works as a coherent source of light—from this time on, the properties of the light field could be controlled in a well-defined manner and were used as an instrumental tool of high precision. Only few decades later, in the era of photonics, ultrashort pulses of this laser light ha ...
Few-cycle terahertz generation and spectroscopy of nanostructures
... in a relatively thin layer of GaAs, and an absorption from a few per cent to 50% can be obtained for a GaAs layer as thin as 65 nm. While the first case is relevant for THz emitters in standard mode of operation, the second case applies for applications where the thickness of the absorbing layer play ...
... in a relatively thin layer of GaAs, and an absorption from a few per cent to 50% can be obtained for a GaAs layer as thin as 65 nm. While the first case is relevant for THz emitters in standard mode of operation, the second case applies for applications where the thickness of the absorbing layer play ...
GaAs Thermally Based MEMS Devices—Fabrication Techniques
... A GaAs cantilever has also been introduced as a micromechanical device for fabrication of novel probes for scanning probe microscopy (SPM). Recently, the developments in the field of micromachined technology of GaAs cantilevers with integrated tips like those of atomic force microscopy (AFM) cantile ...
... A GaAs cantilever has also been introduced as a micromechanical device for fabrication of novel probes for scanning probe microscopy (SPM). Recently, the developments in the field of micromachined technology of GaAs cantilevers with integrated tips like those of atomic force microscopy (AFM) cantile ...
Novel Metrology Techniques Resolve Strong-Field
... Laser pulses can observe and control electronic properties of matter on the time scale of the optical field cycle [1]. In case the transient field strength reaches values just below the damage threshold of the material, the polarization response of the excited system depends on the field oscillation ...
... Laser pulses can observe and control electronic properties of matter on the time scale of the optical field cycle [1]. In case the transient field strength reaches values just below the damage threshold of the material, the polarization response of the excited system depends on the field oscillation ...
Femtosecond spectroscopy of solid hydrogen - diss.fu
... A well established method to do this is the so called time resolved optical Kerr effect (OKE) spectroscopy, a Raman technique that is sensitive to induced anisotropies [22–24]. It was extensively used in our workgroup within the doctoral thesis of Nina Owschimikow, who studied rotational alignment d ...
... A well established method to do this is the so called time resolved optical Kerr effect (OKE) spectroscopy, a Raman technique that is sensitive to induced anisotropies [22–24]. It was extensively used in our workgroup within the doctoral thesis of Nina Owschimikow, who studied rotational alignment d ...
The Development of Femtosecond Electron Diffraction for
... measuring the atomic motions in sub-picosecond temporal resolution and sub-milli-angstrom spatial resolution. In the path of the development of FED various technical challenges have been overcome and an unprecedented capability has been achieved. These advancements allow us to study a range of ultra ...
... measuring the atomic motions in sub-picosecond temporal resolution and sub-milli-angstrom spatial resolution. In the path of the development of FED various technical challenges have been overcome and an unprecedented capability has been achieved. These advancements allow us to study a range of ultra ...
Resolution enhancement techniques in microscopy
... Because of the importance of enhanced resolution for science, technology and medicine, microscopy is widely regarded an important discovery: advances in optical microscopy correlate well with advances in our understanding of biology, and medicine [Masters 2008; 2009a; 2009b]. Schellenberg edited a b ...
... Because of the importance of enhanced resolution for science, technology and medicine, microscopy is widely regarded an important discovery: advances in optical microscopy correlate well with advances in our understanding of biology, and medicine [Masters 2008; 2009a; 2009b]. Schellenberg edited a b ...
Estimation of longitudinal resolution in optical coherence
... Significant differences in computed longitudinal resolution and coherence length for real and theoretical sources with the same bandwidth and center wavelength but with different spectral functions were presented. Such results demonstrate that it is important to take into account the shape of the so ...
... Significant differences in computed longitudinal resolution and coherence length for real and theoretical sources with the same bandwidth and center wavelength but with different spectral functions were presented. Such results demonstrate that it is important to take into account the shape of the so ...
Fabrication of functional surfaces using ultrashort laser pulse ablation
... industry. Added to the increase of laser power, the decreasing duration of optical pulses has been one of the major aims in laser development. Although the first pulsed lasers with pulse length in the femtosecond (fs) range were manufactured a couple of decades ago, they are still widely studied. No ...
... industry. Added to the increase of laser power, the decreasing duration of optical pulses has been one of the major aims in laser development. Although the first pulsed lasers with pulse length in the femtosecond (fs) range were manufactured a couple of decades ago, they are still widely studied. No ...
Introduction to Camouflage and Deception
... in nature have bewildering diversity and complexity all of which do not seem to have counterparts or could be duplicated even in the modern war of today. One typical example is that of the chameleon which almost instantaneously changes its colours in order to blend with its background. A s yet, ther ...
... in nature have bewildering diversity and complexity all of which do not seem to have counterparts or could be duplicated even in the modern war of today. One typical example is that of the chameleon which almost instantaneously changes its colours in order to blend with its background. A s yet, ther ...
High-Q Microresonators as Lasing Elements for Silicon Photonics
... say how much I have valued sitting next to this brilliant man. The sum total of knowledge in his head is astonishing. Whether it be swagelok fittings or the religious symbology on the backs of automobiles, I doubt there is a conversational topic that Tom wouldn’t be able to contribute meaningfully to ...
... say how much I have valued sitting next to this brilliant man. The sum total of knowledge in his head is astonishing. Whether it be swagelok fittings or the religious symbology on the backs of automobiles, I doubt there is a conversational topic that Tom wouldn’t be able to contribute meaningfully to ...
Measuring amplitude and phase in optical fields with
... require coherent detection methods, in particular heterodyne scanning probe microscope (heterodyne SNOM), which allow the measurement of amplitude and phase of the optical field with sub-wavelength resolution. We discuss some basic properties of phase distributions. Light waves diffracted by microst ...
... require coherent detection methods, in particular heterodyne scanning probe microscope (heterodyne SNOM), which allow the measurement of amplitude and phase of the optical field with sub-wavelength resolution. We discuss some basic properties of phase distributions. Light waves diffracted by microst ...
Multidimensional Vibrational Spectroscopy of Hydrogen Bonds in
... donor forms a covalent bond with the hydrogen atom whereas the interaction between the hydrogen atom and the acceptor is often considerably weaker∗ [1]. Despite its simplicity, the relevance of hydrogen bonds in nature can hardly be overestimated. It is a unique interaction that is strong enough to ...
... donor forms a covalent bond with the hydrogen atom whereas the interaction between the hydrogen atom and the acceptor is often considerably weaker∗ [1]. Despite its simplicity, the relevance of hydrogen bonds in nature can hardly be overestimated. It is a unique interaction that is strong enough to ...
Distance Sensing with Dynamic Speckles
... dynamic speckle velocity at the observation plane depends on the distance between the laser and the object surface [4]. This provides an opportunity to build a simple profiler, as speckle velocity can be easily measured using the technique of spatial filtering [5]. However, the speckle method was al ...
... dynamic speckle velocity at the observation plane depends on the distance between the laser and the object surface [4]. This provides an opportunity to build a simple profiler, as speckle velocity can be easily measured using the technique of spatial filtering [5]. However, the speckle method was al ...
Semiconductor Lasers Using Diffused Quantum
... the most commonly used p-type dopant is zinc [16], [17], while the n-type dopant is silicon [18]–[20]. It has been shown that the lateral optical confinement of buried heterostructure QW lasers can be realized by selective interdiffusion of zinc [16], [17] or silicon [18]–[20] to disorder the active ...
... the most commonly used p-type dopant is zinc [16], [17], while the n-type dopant is silicon [18]–[20]. It has been shown that the lateral optical confinement of buried heterostructure QW lasers can be realized by selective interdiffusion of zinc [16], [17] or silicon [18]–[20] to disorder the active ...
Stabler, Graham (2005) High resolution wide field surface plasmon
... It was mentioned that the k vector of the incident light and SP must match in order to excite SPs. This is because the metal layer is a waveguide structure with a finite number of solutions to Maxwell's equations that produce guided waves. Unlike ...
... It was mentioned that the k vector of the incident light and SP must match in order to excite SPs. This is because the metal layer is a waveguide structure with a finite number of solutions to Maxwell's equations that produce guided waves. Unlike ...
Fluorescence of coumarins and xanthenes after two
... Ducuing6 at ruby and neodymium frequencies for which results of the two-photon cross sections were given.6,7 Two-photon absorption is of interest in spectroscopy because two-photon transitions are governed by different selection rules than one-photon absorption transitions.8 Therefore transitions be ...
... Ducuing6 at ruby and neodymium frequencies for which results of the two-photon cross sections were given.6,7 Two-photon absorption is of interest in spectroscopy because two-photon transitions are governed by different selection rules than one-photon absorption transitions.8 Therefore transitions be ...
AFM-IR
AFM-IR refers to atomic force microscope (AFM) based infrared (IR) spectroscopy. AFM-IR is a technique for chemical analysis of samples at nanoscale spatial resolution. AFM-IR is related to techniques including Tip-Enhanced Raman Spectroscopy (TERS) and scanning near-field optical microscopy (SNOM) and other methods of vibrational analysis with scanning probe microscopy. The AFM-IR technique uses a sharp tip of an AFM probe to measure the absorption of infrared light by a sample. Recording the amount of IR absorption as a function of wavelength or wavenumber creates nanoscale IR absorption spectra, which can be used to chemically characterize and even identify unknown materials. Recording the IR absorption as a function of position can be used to create chemical composition maps that show the spatial distribution of different chemical components. AFM-IR can overcome the diffraction limit that limits the spatial resolution of conventional infrared microscopy and microspectroscopy to the scale of several microns. AFM-IR can achieve spatial resolution down to around 20 nm, limited in some case only by the sharpness of the AFM probe tip and sensitivity down to the scale of molecular monolayers.