Quantifying and pinpointing sources of noise in optical tweezers experiments
... Often, the measurement chamber of an optical trapping experiment is mounted on a piezo-electric stage. To investigate the possible contribution from the piezo stage to the noise spectrum we measured the Allan variance for two similar trapping experiments. In Figure 5 one sees the first case with the ...
... Often, the measurement chamber of an optical trapping experiment is mounted on a piezo-electric stage. To investigate the possible contribution from the piezo stage to the noise spectrum we measured the Allan variance for two similar trapping experiments. In Figure 5 one sees the first case with the ...
Metamaterials: a new frontier of science and technology Chem. Soc. Rev 40
... By overlapping two sets of meta-structures with er,eff o 0 and mr,eff o 0 in the same frequency window, we expect to create metamaterials with a negative effective refractive index (i.e., neff o 0), which were first experimentally demonstrated by Smith and colleagues in the microwave domain.14,15 A wedge ...
... By overlapping two sets of meta-structures with er,eff o 0 and mr,eff o 0 in the same frequency window, we expect to create metamaterials with a negative effective refractive index (i.e., neff o 0), which were first experimentally demonstrated by Smith and colleagues in the microwave domain.14,15 A wedge ...
Analysis of Tilted Grating Etalon for DWDM Demultiplexer Sommart Sang-Ngern, Non-member
... components, many techniques have been researched. For examples they include, a Fiber Bragg Grating (FBG) [1]-[2], Fabry-Perot Ti-diffused LiNbO3 [3] and Tilted grating structure [4]. The latter one was first demonstrated in 1999 and it is one of our interesting topics. Fig. 1 illustrates the structu ...
... components, many techniques have been researched. For examples they include, a Fiber Bragg Grating (FBG) [1]-[2], Fabry-Perot Ti-diffused LiNbO3 [3] and Tilted grating structure [4]. The latter one was first demonstrated in 1999 and it is one of our interesting topics. Fig. 1 illustrates the structu ...
Document
... What is an optical resonator? An optical resonator, the optical counterpart of an electronic resonant circuit, confines and stores light at certain resonance frequencies. It may be viewed as an optical transmission system incorporating feedback; light circulates or is repeatedly reflected within the ...
... What is an optical resonator? An optical resonator, the optical counterpart of an electronic resonant circuit, confines and stores light at certain resonance frequencies. It may be viewed as an optical transmission system incorporating feedback; light circulates or is repeatedly reflected within the ...
Plasmonic metamaterials Review Kan Yao and Yongmin Liu*
... signal so that the vibrational information of single molecules can be probed and recorded [28–30]. Tip-enhanced Raman spectroscopy (TERS) further improves this resolution. Very recently, there has been a report on TERS-based spectral imaging with unprecedented submolecular spatial resolution (below ...
... signal so that the vibrational information of single molecules can be probed and recorded [28–30]. Tip-enhanced Raman spectroscopy (TERS) further improves this resolution. Very recently, there has been a report on TERS-based spectral imaging with unprecedented submolecular spatial resolution (below ...
Finite-energy, accelerating Bessel pulses
... Recently the existence of optical beams that may freely accelerate in the transverse spatial dimension has been reported [1, 2] and the possibility to observe a similar acceleration in the temporal dimension of pulses has also been predicted [3, 4] These pulses are called “Airy” pulses due to the Ai ...
... Recently the existence of optical beams that may freely accelerate in the transverse spatial dimension has been reported [1, 2] and the possibility to observe a similar acceleration in the temporal dimension of pulses has also been predicted [3, 4] These pulses are called “Airy” pulses due to the Ai ...
Changes in spatial extent and peak double optical density of human
... macular degeneration [7–9]. Macular pigment optical density (MPOD) has been demonstrated to increase after diets rich in zeaxanthin and lutein [10–16]. Measurements of MPOD as a function of age have been carried out using different techniques. Some studies using fundus reflectance spectroscopy found ...
... macular degeneration [7–9]. Macular pigment optical density (MPOD) has been demonstrated to increase after diets rich in zeaxanthin and lutein [10–16]. Measurements of MPOD as a function of age have been carried out using different techniques. Some studies using fundus reflectance spectroscopy found ...
Validity of the Rytov Approximation in Optical Propagation
... The applicability of the Rytov approximation to the calculation of the characteristics of optical propagation in a weakly inhomogeneous random medium is investigated. The condition that the mean square value of the second term in the associated perturbation expansion be smaller than that of the firs ...
... The applicability of the Rytov approximation to the calculation of the characteristics of optical propagation in a weakly inhomogeneous random medium is investigated. The condition that the mean square value of the second term in the associated perturbation expansion be smaller than that of the firs ...
Biosensing under an applied voltage using optical waveguide
... tracking experiment is performed where the effective refractive indices associated with the transverse electric and transverse magnetic modes are recorded every 23.5 s. Once a stable baseline is achieved, a dc voltage is applied across the ITO and platinum electrodes (DV / VITO/VPt). For a positiv ...
... tracking experiment is performed where the effective refractive indices associated with the transverse electric and transverse magnetic modes are recorded every 23.5 s. Once a stable baseline is achieved, a dc voltage is applied across the ITO and platinum electrodes (DV / VITO/VPt). For a positiv ...
Picosecond-pulse amplification with an external passive optical cavity
... In conclusion, we have demonstrated experimentally that amplif ication of the picosecond pulses of a mode-locked laser can be achieved through coherent addition of the pulses in a passive optical cavity. The present pulse amplif ication scheme provides three times higher pulse energies than what can ...
... In conclusion, we have demonstrated experimentally that amplif ication of the picosecond pulses of a mode-locked laser can be achieved through coherent addition of the pulses in a passive optical cavity. The present pulse amplif ication scheme provides three times higher pulse energies than what can ...
Structural and optical properties of visible active
... respect to each other by the tilting and displacement of the atoms in the octahedral building blocks that comprise the WO3 structure. The thermodynamically favored phase is reported to change with temperature (at standard pressure) for crystalline bulk WO3 as follows: monoclinic Pc (e-WO3) up to 230 ...
... respect to each other by the tilting and displacement of the atoms in the octahedral building blocks that comprise the WO3 structure. The thermodynamically favored phase is reported to change with temperature (at standard pressure) for crystalline bulk WO3 as follows: monoclinic Pc (e-WO3) up to 230 ...
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... the plate and the medium and a diffusive–nondiffusive interface at the output. In most cases, to detect and characterize a hidden object within such media, this system is approximated as a one-layered medium or as a semi-infinite homogeneous medium. With the aid of the reflection and transmission co ...
... the plate and the medium and a diffusive–nondiffusive interface at the output. In most cases, to detect and characterize a hidden object within such media, this system is approximated as a one-layered medium or as a semi-infinite homogeneous medium. With the aid of the reflection and transmission co ...
Metamaterials: a new frontier of science and technology Chem. Soc. Rev 40
... respectively. Substituting proper values into eqn (5), we can characterize material properties over a wide frequency range from microwave to optical. For noble metals, op,e is at visible or UV frequency and o0,e is taken as zero under the free electron approximation. This means that the permittivit ...
... respectively. Substituting proper values into eqn (5), we can characterize material properties over a wide frequency range from microwave to optical. For noble metals, op,e is at visible or UV frequency and o0,e is taken as zero under the free electron approximation. This means that the permittivit ...
INFLUENCE OF OPTICAL PROPERTIES AND FIBERSEPARATION ON LASER DOPPLER FLOWMETRY
... thickness of 20-22 µm. Each of these discs were separated from each other by a static layer (approximately 95 µm of thickness), containing four pieces of static structure with different optical properties. These pieces were located at the same radial distance from the centre of the tissue phantom, w ...
... thickness of 20-22 µm. Each of these discs were separated from each other by a static layer (approximately 95 µm of thickness), containing four pieces of static structure with different optical properties. These pieces were located at the same radial distance from the centre of the tissue phantom, w ...
Surface Plasmon Engineering in Graphene Functionalized with
... molecules have been shown experimentally to produce n-type or p-type doping in graphene by charge transfer. Using standard patterning processes such as e-beam and dip-pen lithography, it is possible to adsorb molecules on graphene in desired patterns to produce point-by-point spatially tailored feat ...
... molecules have been shown experimentally to produce n-type or p-type doping in graphene by charge transfer. Using standard patterning processes such as e-beam and dip-pen lithography, it is possible to adsorb molecules on graphene in desired patterns to produce point-by-point spatially tailored feat ...
Silicon photonics
Silicon photonics is the study and application of photonic systems which use silicon as an optical medium. The silicon is usually patterned with sub-micrometre precision, into microphotonic components. These operate in the infrared, most commonly at the 1.55 micrometre wavelength used by most fiber optic telecommunication systems. The silicon typically lies on top of a layer of silica in what (by analogy with a similar construction in microelectronics) is known as silicon on insulator (SOI).Silicon photonic devices can be made using existing semiconductor fabrication techniques, and because silicon is already used as the substrate for most integrated circuits, it is possible to create hybrid devices in which the optical and electronic components are integrated onto a single microchip. Consequently, silicon photonics is being actively researched by many electronics manufacturers including IBM and Intel, as well as by academic research groups such as that of Prof. Michal Lipson, who see it is a means for keeping on track with Moore's Law, by using optical interconnects to provide faster data transfer both between and within microchips.The propagation of light through silicon devices is governed by a range of nonlinear optical phenomena including the Kerr effect, the Raman effect, two photon absorption and interactions between photons and free charge carriers. The presence of nonlinearity is of fundamental importance, as it enables light to interact with light, thus permitting applications such as wavelength conversion and all-optical signal routing, in addition to the passive transmission of light.Silicon waveguides are also of great academic interest, due to their ability to support exotic nonlinear optical phenomena such as soliton propagation.