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The first book on the topic, and written by the founder of the technique, this comprehensive resource provides a detailed overview of sum-frequency spectroscopy, its fundamental principles, and the wide range of applications for surfaces, interfaces, and bulk. Beginning with an overview of the historical context, and introductions to the basic theory of nonlinear optics and surface sum-frequency generation, topics covered include discussion of different experimental arrangements adopted by researchers, notes on proper data analysis, an up-to-date survey commenting on the wide range of successful applications of the tool, and a valuable insight into current unsolved problems and potential areas to be explored in the future. With the addition of chapter appendices that offer the opportunity for more in-depth theoretical discussion, this is an essential resource that integrates all aspects of the subject and is ideal for anyone using, or interested in using, sum-frequency spectroscopy.

Laser spectroscopy. --- Nonlinear optics. --- Nonlinear optical spectroscopy. --- Second harmonic generation. --- Surface chemistry. --- Chemistry, Surface --- Interfaces, Chemistry of --- Surface phenomena --- Surfaces (Chemistry) --- Chemistry, Physical and theoretical --- Capillarity --- Surface energy --- Surface tension --- Surfaces (Physics) --- Optical second harmonic generation --- SHG (Second harmonic generation) --- Nonlinear optics --- Spectrum analysis --- Optics, Nonlinear --- Optics --- Lasers

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The first nonlinear optical effect was observed in the 19th century by John Kerr. Nonlinear optics, however, started to grow up only after the invention of the laser, when intense light sources became easily available. The seminal studies by Peter Franken and Nicolaas Bloembergen, in the 1960s, paved the way for the development of today’s nonlinear photonics, the field of research that encompasses all the studies, designs, and implementations of nonlinear optical devices that can be used for the generation, communication, and processing of information. This field has attracted significant attention, partly due to the great potential of exploiting the optical nonlinearities of new or advanced materials to induce new phenomena and achieve new functions. According to Clarivate Web of Science, almost 200,000 papers were published that refer to the topic “nonlinear optic*”. Over 36,000 papers were published in the last four years (2015–2018) with the same keyword, and over 17,000 used the keyword “nonlinear photonic*”. The present Special Issue of Micromachines aims at reviewing the current state of the art and presenting perspectives of further development. Fundamental and applicative aspects are considered, with special attention paid to hot topics that may lead to technological and scientific breakthroughs.

Technology: general issues --- GeSn --- quantum dot --- electric field --- intersubband nonlinear optics --- absorption coefficients --- refractive index changes --- pure state --- cascaded spontaneous parametric down-conversion (SPDC) --- numerical simulation --- transparent conductive oxide --- coherent perfect absorption --- epsilon-near-zero media --- light-with-light modulation --- refractive index change --- non-linear photonics --- optical fibers --- thermal poling --- numerical analysis --- extrinsic chirality --- second harmonic generation --- GaAs nanowires --- plasmonic coating --- second-harmonic generation --- waveguide --- AlGaAs --- optical frequency combs --- quadratic nonlinearity --- optical parametric oscillator --- modulation instability --- stimulated raman scattering --- fiber optics --- amplifiers --- lasers --- optical communication systems --- kerr nonlinearity --- whispering gallery mode --- optical resonators --- stimulated brillouin scattering --- optomechanical oscillations --- nonlinear optics --- stimulated Raman scattering --- microphotonics --- nanophotonics --- nonlinear waveguide --- optical microcavity --- photonics crystals --- nanocrystals --- optical resonances --- harmonic generation --- four-wave mixing --- optical switching --- sub-wavelength gratings --- Mie scattering --- Fano resonances --- guided-mode resonance --- terahertz --- nonlinear optical conversion --- complex optical systems --- adaptive imaging --- single-pixel imaging --- surface nonlinear photonics --- n/a

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The first nonlinear optical effect was observed in the 19th century by John Kerr. Nonlinear optics, however, started to grow up only after the invention of the laser, when intense light sources became easily available. The seminal studies by Peter Franken and Nicolaas Bloembergen, in the 1960s, paved the way for the development of today’s nonlinear photonics, the field of research that encompasses all the studies, designs, and implementations of nonlinear optical devices that can be used for the generation, communication, and processing of information. This field has attracted significant attention, partly due to the great potential of exploiting the optical nonlinearities of new or advanced materials to induce new phenomena and achieve new functions. According to Clarivate Web of Science, almost 200,000 papers were published that refer to the topic “nonlinear optic*”. Over 36,000 papers were published in the last four years (2015–2018) with the same keyword, and over 17,000 used the keyword “nonlinear photonic*”. The present Special Issue of Micromachines aims at reviewing the current state of the art and presenting perspectives of further development. Fundamental and applicative aspects are considered, with special attention paid to hot topics that may lead to technological and scientific breakthroughs.

Technology: general issues --- GeSn --- quantum dot --- electric field --- intersubband nonlinear optics --- absorption coefficients --- refractive index changes --- pure state --- cascaded spontaneous parametric down-conversion (SPDC) --- numerical simulation --- transparent conductive oxide --- coherent perfect absorption --- epsilon-near-zero media --- light-with-light modulation --- refractive index change --- non-linear photonics --- optical fibers --- thermal poling --- numerical analysis --- extrinsic chirality --- second harmonic generation --- GaAs nanowires --- plasmonic coating --- second-harmonic generation --- waveguide --- AlGaAs --- optical frequency combs --- quadratic nonlinearity --- optical parametric oscillator --- modulation instability --- stimulated raman scattering --- fiber optics --- amplifiers --- lasers --- optical communication systems --- kerr nonlinearity --- whispering gallery mode --- optical resonators --- stimulated brillouin scattering --- optomechanical oscillations --- nonlinear optics --- stimulated Raman scattering --- microphotonics --- nanophotonics --- nonlinear waveguide --- optical microcavity --- photonics crystals --- nanocrystals --- optical resonances --- harmonic generation --- four-wave mixing --- optical switching --- sub-wavelength gratings --- Mie scattering --- Fano resonances --- guided-mode resonance --- terahertz --- nonlinear optical conversion --- complex optical systems --- adaptive imaging --- single-pixel imaging --- surface nonlinear photonics

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Sight is the dominant sense of mankind to apprehend the world at the earth scale and beyond the frontiers of the infinite, from the nanometer to the incommensurable. Primarily based on sunlight and natural and artificial light sources, optics has been the major companion of spectroscopy since scientific observation began. The invention of the laser in the early sixties has boosted optical spectroscopy through the intrinsic or specific symmetry electronic properties of materials at the multiscale (birefringence, nonlinear and photonic crystals), revealed by the ability to monitor light polarization inside or on the surface of designed objects. This Special Issue of Symmetry features articles and reviews that are of tremendous interest to scientists who study linear and nonlinear optics, all oriented around the common axis of symmetry. Contributions transverse the entire breadth of this field, including those concerning polarization and anisotropy within colloids of chromophores and metal/semiconducting nanoparticles probed by UV-visible and fluorescence spectroscopies; microscopic structures of liquid–liquid, liquid–gas, and liquid–solid interfaces; surface- and symmetry-specific optical techniques and simulations, including second-harmonic and sum-frequency generations, and surface-enhanced and coherent anti-Stokes Raman spectroscopies; orientation and chirality of bio-molecular interfaces; symmetry breaking in photochemistry; symmetric multipolar molecules; reversible electronic energy transfer within supramolecular systems; plasmonics; and light polarization effects in materials.

symmetry breaking --- chiral plasmonics --- non-linear optics --- plasmonic devices --- plasmonic sensing --- plasmonics --- LSPR scattering --- polarisation manipulation --- metamaterials --- Faraday effect (rotation) --- magneto-optic Kerr effect (MOKE) --- magnetoplasmonics --- molecular orientation --- spectral unmixing --- infrared absorption --- visible-infrared sum-frequency generation --- Raman scattering --- linear programming --- centrosymmetry --- spectroscopy --- selection rules --- infrared --- Raman --- sum-frequency generation --- interfaces --- molecules --- nanoparticles --- molecular aggregates --- second harmonic generation --- hyper rayleigh scattering --- second harmonic scattering --- light polarizatio --- quantum dots --- phenyl derivative --- UV–Visible spectroscopy --- sum-frequency generation spectroscopy --- dipole–dipole interaction --- polyoxometalates --- donor/acceptor substituents --- first hyperpolarizability --- (time-dependent) DFT --- n/a --- UV-Visible spectroscopy --- dipole-dipole interaction

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The present volume “New Trends in Lithium Niobate: From Bulk to Nanocrystals” contains the materials of a Special Issue of the MDPI journal Crystals dedicated to the memory of Prof. Dr. Ortwin F. Schirmer and provides a new synopsis of his research focusing on LiNbO3. It also includes recent developments, exemplifying the continued interest in this outstanding ferroelectric, non-linear optical and holographic crystal as a workhorse for testing and realizing new ideas and applications.This book starts with reviews on intrinsic and extrinsic crystal defects in LiNbO3 of single-crystal, thin-film or nano-powder forms, studied by various optical, magnetic resonance and nuclear methods, clarifying in particular the reasons for the suppression of anion vacancy formation upon thermal reduction, mechano-chemical processing or irradiations of various types. The reviews are followed by research papers on the experimental and theoretical investigation of small polarons, together with recent results on the properties of Li(Nb,Ta)O3 mixed crystals. Among the various contributions dealing with nonlinear optical applications, papers on device development, entangled photon pair generation and thin films on the Lithium Niobate On Insulator (LNOI) platform can also be found.

lithium niobate --- small polaron hopping --- transient absorption --- mode-locked laser --- nonlinear mirror mode locking --- lithium tantalate --- crystal structure --- chemical composition --- ferroelectrics --- second harmonic generation --- lead-free piezoelectrics --- intrinsic defects --- extrinsic defects --- elemental doping --- ferromagnetism --- diluted-magnetic oxides --- LiNbO3 --- LiTaO3 --- oxide crystals --- lanthanides --- luminescence --- LNOI --- ferroelectric domains --- domain-wall conduction --- AFM --- thin film lithium niobate --- TFLN --- x-cut LN --- domain walls --- piezoresponse force microscopy --- second-harmonic generation --- Raman scattering --- electro-optics --- whispering gallery resonators --- polarons --- photorefractivity --- Marcus-Holstein’s theory --- Monte Carlo simulations --- strontium titanate --- self-trapped electrons --- oxygen vacancies --- defects --- impurity --- intrinsic defect --- paramagnetic ion --- electron paramagnetic resonance --- electron nuclear double resonance --- lithium vacancy --- lithium --- niobate --- epitaxy --- thin film --- liquid phase epitaxy --- molecular beam epitaxy --- sputtering --- pulsed laser deposition --- chemical vapor deposition --- lithium niobate-tantalate --- piezoelectric --- acoustic --- high-temperature --- sensor --- Q-factor --- BAW resonator --- parametric down-conversion --- photon-pair generation --- extended phase matching --- microring resonator --- varFDTD --- lithium tantalate thin film --- electro-optical devices --- lattice location --- radiation damage --- ion beam analysis --- hyperfine interactions --- charge localization --- lattice deformation --- optical response --- density-functional theory --- Bethe-Salpeter equation --- nanoparticles --- nanopowders --- X-ray diffraction --- Raman spectroscopy --- temperature dependence of electroconductivity --- bipolarons --- defect structure and generation --- Li diffusion --- bulk crystals --- thin films --- nanocrystals