Plasmonic modes of gold nano-particle arrays on thin gold
... nanoparticles [Fig. 1(a,b)] with side length d ∼ 100 nm, height hp = 30 nm and array periods Λ = 200 − 500 nm on a hf = 25 nm thick gold film. The overall size of the arrays is 100 × 100 µm. For all array periods we observe one extinction peak at ∼ 520 nm and, additionally, a second peak which shift ...
... nanoparticles [Fig. 1(a,b)] with side length d ∼ 100 nm, height hp = 30 nm and array periods Λ = 200 − 500 nm on a hf = 25 nm thick gold film. The overall size of the arrays is 100 × 100 µm. For all array periods we observe one extinction peak at ∼ 520 nm and, additionally, a second peak which shift ...
d) Laser system and its applications Question Bank
... Q.14: Derive the Planck’s radiation formula and show that the Rayleigh-Jeans law can be obtained from it as a limiting form. Q.15: Obtain Wien’s displacement law using the Planck’s radiation formula. Show that the total energy density for a black-body radiation is proportional to T4. Q.16: Derive t ...
... Q.14: Derive the Planck’s radiation formula and show that the Rayleigh-Jeans law can be obtained from it as a limiting form. Q.15: Obtain Wien’s displacement law using the Planck’s radiation formula. Show that the total energy density for a black-body radiation is proportional to T4. Q.16: Derive t ...
Technical Article
... needed to scan ~10ps delays at kilohertz rates in order to achieve real-time imaging. An alternate approach to coherence gating that does not employ a scanning delay line involves acquiring as a function of optical wavenumber the interferometric signal generated by mixing sample light with reference ...
... needed to scan ~10ps delays at kilohertz rates in order to achieve real-time imaging. An alternate approach to coherence gating that does not employ a scanning delay line involves acquiring as a function of optical wavenumber the interferometric signal generated by mixing sample light with reference ...
1 - www2
... High energy, power, intensity and brightness. In a laser system, large energy can stored and released in a very short time resulting in enormous output power. The extremely high power can also be focused to very small areas generating extremely high-intensity values. Continuous wave lasers having p ...
... High energy, power, intensity and brightness. In a laser system, large energy can stored and released in a very short time resulting in enormous output power. The extremely high power can also be focused to very small areas generating extremely high-intensity values. Continuous wave lasers having p ...
Document
... RNA fragment Poly[G]-Poly[C]. A significant correlation between the calculated and experimentally observed spectra of RNA homopolymers was achieved. Taken together these results confirm the fundamental physical nature of the observed resonance structure that is caused by the internal vibrational mo ...
... RNA fragment Poly[G]-Poly[C]. A significant correlation between the calculated and experimentally observed spectra of RNA homopolymers was achieved. Taken together these results confirm the fundamental physical nature of the observed resonance structure that is caused by the internal vibrational mo ...
Athermal laser design
... Thermal drift in loss is typically manifest in the most spectrally sharp loss of the cavity, the mirror. For in-plane lasers with integrated DBR mirrors this drift, though it doesn’t drift as rapidly as the gain peak, is the single most significant factor in laser wavelength drift. In contrast, in s ...
... Thermal drift in loss is typically manifest in the most spectrally sharp loss of the cavity, the mirror. For in-plane lasers with integrated DBR mirrors this drift, though it doesn’t drift as rapidly as the gain peak, is the single most significant factor in laser wavelength drift. In contrast, in s ...
0710-Sepsis-2007
... surfaces. In order to reduce surface reflection and produce high contrast images of microcirculation, the reflected light is viewed using an analyzer with an axis of polarization 90° to that of the incident light. Various OPM methods have been used to identify the nature of microcirculatory dysfunct ...
... surfaces. In order to reduce surface reflection and produce high contrast images of microcirculation, the reflected light is viewed using an analyzer with an axis of polarization 90° to that of the incident light. Various OPM methods have been used to identify the nature of microcirculatory dysfunct ...
Tao Yuan, Jingzhou Xu, and Xicheng Zhang Rensselaer
... Criterion. The limitation is more serious for THz image system because of the long wavelength used (~300 m for 1THz). Sub-wavelength resolution can be achieved by near field technology shown in figure 1 (b) and (c), which are subwavelength aperture and aperture-less method. In apertureless method, ...
... Criterion. The limitation is more serious for THz image system because of the long wavelength used (~300 m for 1THz). Sub-wavelength resolution can be achieved by near field technology shown in figure 1 (b) and (c), which are subwavelength aperture and aperture-less method. In apertureless method, ...
Nonconfocal Differential Interferometry Sensing Scheme for
... of the cantilever consists of using optical interferometry,1–6) capacitance,7,8) point-contact current-imaging,9) beam deflection,10–14) and magnetoresistive head.15) Constructing the force-sensing cantilever/tip device is a major task for the force microscope. Many chemistries and metallic modified c ...
... of the cantilever consists of using optical interferometry,1–6) capacitance,7,8) point-contact current-imaging,9) beam deflection,10–14) and magnetoresistive head.15) Constructing the force-sensing cantilever/tip device is a major task for the force microscope. Many chemistries and metallic modified c ...
Thermal Expansion Coefficient of Polycrystalline
... Si substrate. The beam, shown in Fig. 2, is 100 m long, and has a top-to-bottom layer width ratio of 0.54. The beams are fabricated on an n-type, 3 in. Si wafer. The bottom SiO2 layer is thermally grown on the wafer at 1100 °C. The poly-Si layer is deposited by low pressure chemical vapor depositio ...
... Si substrate. The beam, shown in Fig. 2, is 100 m long, and has a top-to-bottom layer width ratio of 0.54. The beams are fabricated on an n-type, 3 in. Si wafer. The bottom SiO2 layer is thermally grown on the wafer at 1100 °C. The poly-Si layer is deposited by low pressure chemical vapor depositio ...
AcuityXR Technology Significantly Enhances Lateral Resolution of
... To test this, a sample with two 350nm lines, separated by 350nm were measured on a Bruker ContourGT X8 Optical Profiler System using standard Phase Shifting Interferometry (PSI) and AcuityXR PSI measurement ...
... To test this, a sample with two 350nm lines, separated by 350nm were measured on a Bruker ContourGT X8 Optical Profiler System using standard Phase Shifting Interferometry (PSI) and AcuityXR PSI measurement ...
properties of laser beams
... • They increase the length of the active medium, by making the beam pass through it many times. • They determine the boundary conditions for the electromagnetic fields inside the laser cavity. • The axis connecting the centres of these mirrors and perpendicular to them is called Optical Axis of the ...
... • They increase the length of the active medium, by making the beam pass through it many times. • They determine the boundary conditions for the electromagnetic fields inside the laser cavity. • The axis connecting the centres of these mirrors and perpendicular to them is called Optical Axis of the ...
Wavelength-tuning interferometry of intraocular distances
... reference beam.30 An external-cavity tunable laser diode is used as a light source ~New Focus Model 6224!. Its center wavelength is 780 nm with a modehop-free tuning range of Dl ; 9 nm. Figure 3 shows the power spectrum.33 This laser has two wavelength-tuning modes: A coarse tuning mode over the who ...
... reference beam.30 An external-cavity tunable laser diode is used as a light source ~New Focus Model 6224!. Its center wavelength is 780 nm with a modehop-free tuning range of Dl ; 9 nm. Figure 3 shows the power spectrum.33 This laser has two wavelength-tuning modes: A coarse tuning mode over the who ...
Loss measurements on semiconductor lasers by
... variable d of the wave number b optical path length. The variable d is proportional to the cavity length, and the proportionality factor is n/ p . Although the complex function of Eq. ~5! consists, in general, of amplitude and phase, we will use and plot the amplitude only for the following consider ...
... variable d of the wave number b optical path length. The variable d is proportional to the cavity length, and the proportionality factor is n/ p . Although the complex function of Eq. ~5! consists, in general, of amplitude and phase, we will use and plot the amplitude only for the following consider ...
Dynamic measurements using a Fizeau
... The encoding process for instantaneous interferometry may be accomplished through spatial separation of the interfering beams,1,2,3,4 through the introduction of a tilt angle, as is possible in a modified Fizeau,5,6,7 or through coherence matching of two interferometers that operate in tandem.8,9 Si ...
... The encoding process for instantaneous interferometry may be accomplished through spatial separation of the interfering beams,1,2,3,4 through the introduction of a tilt angle, as is possible in a modified Fizeau,5,6,7 or through coherence matching of two interferometers that operate in tandem.8,9 Si ...
Development of a67kHz Internal OPO Laser for Hellborne LIdar
... The core diameter is 600 |um, the numerical of aperture (N.A.) is 0.2, and the maximum fiber-end output is 16 W. Nd:YVO4 is used as the laser crystal that comprises the non-dope section with the dimensions of2 x 5 x 5 mm and the Nd3+lat.% dope section with the dimensions of3 x 5 x 5 mm. Pumping is p ...
... The core diameter is 600 |um, the numerical of aperture (N.A.) is 0.2, and the maximum fiber-end output is 16 W. Nd:YVO4 is used as the laser crystal that comprises the non-dope section with the dimensions of2 x 5 x 5 mm and the Nd3+lat.% dope section with the dimensions of3 x 5 x 5 mm. Pumping is p ...
Direct index of refraction measurement at extreme
... The absorptive part β(ω) of the refractive index at EUV wavelengths is well-tabulated by photoabsorption measurements. However, the real (dispersive) part of the refractive index δ(ω) at EUV wavelengths is less accurately known. Interferometry, which can provide independent measurements of δ and β, ...
... The absorptive part β(ω) of the refractive index at EUV wavelengths is well-tabulated by photoabsorption measurements. However, the real (dispersive) part of the refractive index δ(ω) at EUV wavelengths is less accurately known. Interferometry, which can provide independent measurements of δ and β, ...
Y.H. Kim, G. Voulgaris, and M.A. Goni, 2005, Estimation of
... Estuaries are dynamic environments that play an important role in the cycling of particulate organic carbon (POC). Tidal and residual flows, as the latter might be influenced by bathymetry, freshwater discharge and/or atmospheric forcing determine the net flux and transport of POC. Traditional wet-c ...
... Estuaries are dynamic environments that play an important role in the cycling of particulate organic carbon (POC). Tidal and residual flows, as the latter might be influenced by bathymetry, freshwater discharge and/or atmospheric forcing determine the net flux and transport of POC. Traditional wet-c ...
Single-shot Detection of Wavepacket Evolution
... minutes, as opposed to hours, eliminating experimental instabilities such as laser drift or atomic source fluctuations. Experiments once considered too time consuming are now readily performed using the imaging detector. We note that only one dimension of the detection slit is currently utilized. One ...
... minutes, as opposed to hours, eliminating experimental instabilities such as laser drift or atomic source fluctuations. Experiments once considered too time consuming are now readily performed using the imaging detector. We note that only one dimension of the detection slit is currently utilized. One ...
Terahertz modulation of the Faraday effect by laser pulses via the
... Tb3+ ion (1.36 and 2.25 THz) or phonon modes (5.1 and 5.4 THz).12,24–26 Note that the highest frequency observed in the experiment is about 7.27 THz (Supplementary materials G) indicating that the temporal resolution is not worse than 140 fs. This is much shorter than the pulse duration, which can b ...
... Tb3+ ion (1.36 and 2.25 THz) or phonon modes (5.1 and 5.4 THz).12,24–26 Note that the highest frequency observed in the experiment is about 7.27 THz (Supplementary materials G) indicating that the temporal resolution is not worse than 140 fs. This is much shorter than the pulse duration, which can b ...
World Journal Of Engineering ENHANCEMENT OF OPTICAL
... fitting are superimposed on the data as a solid curve. The agreement between experimental data and calculated curve is reasonably good. Based on the fact that the period of oscillation of is 180˚, it is suggested that the phenomenon comes from the birefringence. becomes zero at every 90°, where ...
... fitting are superimposed on the data as a solid curve. The agreement between experimental data and calculated curve is reasonably good. Based on the fact that the period of oscillation of is 180˚, it is suggested that the phenomenon comes from the birefringence. becomes zero at every 90°, where ...
Large-area picosecond laser-induced periodic surface
... default). The used EKSPLA Atlantic picosecond DPSS laser provides a Gaussian laser beam (~ 60 µm focused diameter) with a wavelength of 1064 nm and a pulse length of 13 ps. The pulse frequency can be set up to 1 MHz using a power of up to 60 W. The laser fluence can be changed by adjusting an attenu ...
... default). The used EKSPLA Atlantic picosecond DPSS laser provides a Gaussian laser beam (~ 60 µm focused diameter) with a wavelength of 1064 nm and a pulse length of 13 ps. The pulse frequency can be set up to 1 MHz using a power of up to 60 W. The laser fluence can be changed by adjusting an attenu ...
——— Our CVD diamond has an extremely broad
... the windows, prisms and lenses, their processing and mounting, as well as partial or anti-reflective coatings. Windows, prisms and lenses can be engineered to any required size up to Ø 135 mm in diameter (Diafilm optical grades) and 8 x 8 x 2 mm (single crystal CVD diamond). Mounts can be of simple ...
... the windows, prisms and lenses, their processing and mounting, as well as partial or anti-reflective coatings. Windows, prisms and lenses can be engineered to any required size up to Ø 135 mm in diameter (Diafilm optical grades) and 8 x 8 x 2 mm (single crystal CVD diamond). Mounts can be of simple ...
Near-field amplitude and phase recovery using phase
... We have developed a scattering-based near-field optical microscope (sSNOM) and implemented phase-shifting interferometry (PSI) for local amplitude and phase extraction. The instrument was applied to study fields scattered by polystyrene spheres on glass. The experimental setup is illustrated in Fig. ...
... We have developed a scattering-based near-field optical microscope (sSNOM) and implemented phase-shifting interferometry (PSI) for local amplitude and phase extraction. The instrument was applied to study fields scattered by polystyrene spheres on glass. The experimental setup is illustrated in Fig. ...
Lecture 5
... • For most of microfabrication purposes the process (e.g. additive, subtractive or implantation) has to be applied selectively to particular areas of the wafer: patterning is ...
... • For most of microfabrication purposes the process (e.g. additive, subtractive or implantation) has to be applied selectively to particular areas of the wafer: patterning is ...
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.