arXiv: Optics
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This work discusses an extension to conventional low-coherence interferometry by the introduction of dispersion-encoding. The extension facilitates the measurement of surface height profiles with sub-nm resolution. The selection of a dispersive element for encoding allows for tuning of the axial measurement range and resolution of the setup. The approach is theoretically designed and implemented for applications such as surface profilometry, the characterization of polymeric cross-linking and as...
#1Kazuharu UchiyamaH-Index: 4
Last. Hirokazu HoriH-Index: 18
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We have previously observed an irregular spatial distribution of photon transmission through a photochromic crystal photoisomerized by a local optical near-field excitation, manifesting complex branching processes via the interplay of deformation of the material and near-field photon transfer therein. Furthermore, by combining such naturally constructed complex photon transmission with a simple photon detection protocol, Schubert polynomials, the foundation of versatile permutation operations in...
Optical rogue waves have been extensively studied in the past two decades. However, observations of multidimensional extreme wave events remain surprisingly scarce. In this work we present the experimental demonstration of the spontaneous generation of spatially localized two-dimensional beams in a quadratic nonlinear crystal, which are composed by twin components at the fundamental and the second-harmonic frequencies. These localized spots of light emerge from a wide background beam, and eventu...
#1Guillaume GracianiH-Index: 2
Last. François AmblardH-Index: 21
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Dynamic light scattering techniques are routinely used for numerous industrial and research applications, because they can give access to the motion spectrum of micro- and nano-objects, and therefore to particle sizes or visco-elastic properties. However, measurements are impossible when samples do not scatterer light enough, i.e. when there are too few scattering events due to excessively small scattering cross-sections and/or low concentrations of scatterers. Here, we propose to amplify light ...
#1Paul ChevalierH-Index: 14
#2Arman AmirzhanH-Index: 4
Last. Henry O. EverittH-Index: 40
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Gaseous ammonia has previously been demonstrated as a compelling gain medium for a quantum cascade laser pumped molecular laser (QPML), exhibiting good power efficiency but limited tunability. Here we explore the potential of the ammonia QPML to produce powerful, broadly tunable terahertz frequency lasing on rotational and pure inversion transitions. After theoretically predicting possible laser frequencies, pump thresholds, and efficiencies, we experimentally demonstrate unprecedented tunabilit...
#1Alessandro Tuniz (USYD: University of Sydney)H-Index: 17
#2Markus A. SchmidtH-Index: 42
Last. Boris T. KuhlmeyH-Index: 31
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We evaluate the sensing properties of plasmonic waveguide sensors by calculating their resonant transmission spectra in different regions of the non-Hermitian eigenmode space. We elucidate the pitfalls of using modal dispersion calculations in isolation to predict plasmonic sensor performance, which we address by using a simple model accounting for eigenmode excitation and propagation. Our transmission calculations show that resonant wavelength and spectral width crucially depend on the length o...
#1Boyuan Jin (UNL : University of Nebraska–Lincoln)H-Index: 8
#2Dhananjay Mishra (UNL : University of Nebraska–Lincoln)
Last. Christos Argyropoulos (UNL : University of Nebraska–Lincoln)H-Index: 43
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Spontaneous parametric down-conversion (SPDC) is one of the most versatile nonlinear optical techniques for the generation of entangled and correlated single-photon pairs. However, it suffers from very poor efficiency leading to extremely weak photon generation rates. Here we propose a plasmonic metasurface design based on silver nanostripes combined with a bulk lithium niobate (LiNbO3) crystal to realize a new scalable, ultrathin, and efficient SPDC source. By coinciding fundamental and higher ...
#1Dmitry ZiminH-Index: 2
Last. Nicholas KarpowiczH-Index: 28
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Direct access to the electric field of light provides a subcycle view of the polarization response of matter, thus enabling sensitive metrology in physics, chemistry, and medicine. Optical-field sampling techniques take advantage of some process that lasts much less than an optical cycle of the measured light wave. Most of them rely on the generation of free electrons either by a weak extreme ultraviolet pulse or by a strong optical pulse. The ability of such techniques to detect weak signals is...
#1Jeremy J. Baumberg (University of Cambridge)H-Index: 95
#1Angelos XomalisH-Index: 5
Last. Alejandro MartínezH-Index: 37
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Coherent interconversion of signals between optical and mechanical domains is enabled by optomechanical interactions. Extreme light-matter coupling produced by confining light to nanoscale mode volumes can then access single mid-infrared (MIR) photon sensitivity. Here we utilise the infrared absorption and Raman activity of molecular vibrations in plasmonic nanocavities to demonstrate frequency upconversion. We convert {\lambda}~10 {\mu}m incoming light to visible via surface-enhanced Raman scat...
#1Kevin C. Zhou (Duke University)H-Index: 13
#2Al-Hafeez DhallaH-Index: 12
Last. Joseph A. IzattH-Index: 90
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Illuminating or imaging samples from a broad angular range is essential in a wide variety of computational 3D imaging and resolution-enhancement techniques, such as optical projection tomography (OPT), optical diffraction tomography (ODT), synthetic aperture microscopy, Fourier ptychographic microscopy (FPM), structured illumination microscopy (SIM), photogrammetry, and optical coherence refraction tomography (OCRT). The wider the angular coverage, the better the resolution enhancement or 3D res...
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