@article{43421, abstract = {{The achievement of a flat metasurface has realized extraordinary control over light–matter interaction at the nanoscale, enabling widespread use in imaging, holography, and biophotonics. However, three-dimensional metasurfaces with the potential to provide additional light–matter manipulation flexibility attract only little interest. Here, we demonstrate a three-dimensional metasurface scheme capable of providing dual phase control through out-of-plane plasmonic resonance of L-shape antennas. Under circularly polarized excitation at a specific wavelength, the L-shape antennas with rotating orientation angle act as spatially variant three-dimensional tilted dipoles and are able to generate desire phase delay for different polarization components. Generalized Snell's law is achieved for both in-plane and out-of-plane dipole components through arranging such L-shape antennas into arrays. These three-dimensional metasurfaces suggest a route for wavefront modulation and a variety of nanophotonic applications.}}, author = {{Li, Tianyou and Chen, Yanjie and Wang, Yongtian and Zentgraf, Thomas and Huang, Lingling}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{14}}, publisher = {{AIP Publishing}}, title = {{{Three-dimensional dipole momentum analog based on L-shape metasurface}}}, doi = {{10.1063/5.0142389}}, volume = {{122}}, year = {{2023}}, } @article{45763, abstract = {{Abstract The development of potential theory heightens the understanding of fundamental interactions in quantum systems. In this paper, the bound state solution of the modified radial Klein-Gordon equation is presented for generalised tanh-shaped hyperbolic potential from the Nikiforov-Uvarov method. The resulting energy eigenvalues and corresponding radial wave functions are expressed in terms of the Jacobi polynomials for arbitrary $l$ states. It is also demonstrated that energy eigenvalues strongly correlate with potential parameters for quantum states. Considering particular cases, the generalised tanh-shaped hyperbolic potential and its derived energy eigenvalues exhibit good agreement with the reported findings. Furthermore, the rovibrational energies are calculated for three representative diatomic molecules, namely $\rm{H_{2}}$, $\rm{HCl}$ and $\rm{O_{2}}$. The lowest excitation energies are in perfect agreement with experimental results. Overall, the potential model is displayed to be a viable candidate for concurrently prescribing numerous quantum systems.}}, author = {{Badalov, Vatan and Badalov, Sabuhi}}, issn = {{0253-6102}}, journal = {{Communications in Theoretical Physics}}, keywords = {{Physics and Astronomy (miscellaneous)}}, publisher = {{IOP Publishing}}, title = {{{Generalised tanh-shaped hyperbolic potential: Klein-Gordon equation's bound state solution}}}, doi = {{10.1088/1572-9494/acd441}}, year = {{2023}}, } @article{47993, abstract = {{Structural strain severely impacts material properties, such as the linear and nonlinear optical response. Moreover, strain plays a key role, e.g., in the physics of ferroelectrics and, in particular, of their domain walls. μ-Raman spectroscopy is a well-suited technique for the investigation of such strain effects as it allows to measure the lattice dynamics locally. However, quantifying and reconstructing strain fields from Raman maps requires knowledge on the strain dependence of phonon frequencies. In this paper, we have analyzed both theoretically and experimentally the phonon frequencies in the widely used ferroelectrics lithium niobate and lithium tantalate as a function of uniaxial strain via density functional theory and μ-Raman spectroscopy. Overall, we find a good agreement between our ab initio models and the experimental data performed with a stress cell. The majority of phonons show an increase in frequency under compressive strain, whereas the opposite is observed for tensile strains. Moreover, for E-type phonons, we observe the lifting of degeneracy already at moderate strain fields (i.e., at ±0.2%) along the x and y directions. This paper, hence, allows for the systematic analysis of three-dimensional strains in modern-type bulk and thin-film devices assembled from lithium niobate and tantalate.}}, author = {{Singh, Ekta and Pionteck, Mike N. and Reitzig, Sven and Lange, Michael and Rüsing, Michael and Eng, Lukas M. and Sanna, Simone}}, issn = {{2475-9953}}, journal = {{Physical Review Materials}}, keywords = {{Physics and Astronomy (miscellaneous), General Materials Science}}, number = {{2}}, publisher = {{American Physical Society (APS)}}, title = {{{Vibrational properties of LiNbO3 and LiTaO3 under uniaxial stress}}}, doi = {{10.1103/physrevmaterials.7.024420}}, volume = {{7}}, year = {{2023}}, } @article{31480, abstract = {{Optical geometric phase encoded by in-plane spatial orientation of microstructures has promoted the rapid development of numerous functional meta-devices. However, pushing the concept of the geometric phase toward the acoustic community still faces challenges. In this work, we utilize two acoustic nonlocal metagratings that could support a direct conversion between an acoustic plane wave and a designated vortex mode to obtain the acoustic geometric phase, in which an orbital angular momentum conversion process plays a vital role. In addition, we realize the acoustic geometric phases of different orders by merely varying the orientation angle of the acoustic nonlocal metagratings. Intriguingly, according to our developed theory, we reveal that the reflective acoustic geometric phase, which is twice the transmissive one, can be readily realized by transferring the transmitted configuration to a reflected one. Both the theoretical study and experimental measurements verify the announced transmissive and reflective acoustic geometric phases. Moreover, the reconfigurability and continuous phase modulation that covers the 2π range shown by the acoustic geometric phases provide us with the alternatives in advanced acoustic wavefront control.}}, author = {{Liu, Bingyi and Zhou, Zhiling and Wang, Yongtian and Zentgraf, Thomas and Li, Yong and Huang, Lingling}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{21}}, publisher = {{AIP Publishing}}, title = {{{Experimental verification of the acoustic geometric phase}}}, doi = {{10.1063/5.0091474}}, volume = {{120}}, year = {{2022}}, } @article{36414, abstract = {{ Recently, microcavities with anisotropic materials were shown to be able to create bands with non-zero local Berry curvature. The anisotropic refractive index of the cavity layer is believed to be critical in opening an energy gap at the tilted Dirac points. In this work, we show that the anticrossing between a cavity mode and a Bragg mode can also be realized within an empty microcavity without any birefringent materials in the cavity layer. Nondispersive bands are observed within the energy gap due to the particular refractive index distribution of the sample. The intrinsic TE-TM splitting and XY splitting of DBR mirrors induce the squeezing of the cavity modes in momentum space, so that the nondispersive bands are tilted and spin-dependent. Our results pave the way to investigate interesting physical phenomena of photonic modes close to or in the nondispersive bands without anisotropic cavity layers. }}, author = {{Gao, Ying and Li, Yao and Ma, Xuekai and Gao, Meini and Dai, Haitao and Schumacher, Stefan and Gao, Tingge}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{20}}, publisher = {{AIP Publishing}}, title = {{{Tilting nondispersive bands in an empty microcavity}}}, doi = {{10.1063/5.0093908}}, volume = {{121}}, year = {{2022}}, } @article{40371, abstract = {{Multimode integrated interferometers have great potential for both spectral engineering and metrological applications. However, the material dispersion of integrated platforms constitutes an obstacle that limits the performance and precision of such interferometers. At the same time, two-colour nonlinear interferometers present an important tool for metrological applications, when measurements in a certain frequency range are difficult. In this manuscript, we theoretically developed and investigated an integrated multimode two-colour SU(1,1) interferometer operating in a supersensitive mode. By ensuring the proper design of the integrated platform, we suppressed the dispersion, thereby significantly increasing the visibility of the interference pattern. The use of a continuous wave pump laser provided the symmetry between the spectral shapes of the signal and idler photons concerning half the pump frequency, despite different photon colours. We demonstrate that such an interferometer overcomes the classical phase sensitivity limit for wide parametric gain ranges, when up to 3×104 photons are generated.}}, author = {{Ferreri, Alessandro and Sharapova, Polina R.}}, issn = {{2073-8994}}, journal = {{Symmetry}}, keywords = {{Physics and Astronomy (miscellaneous), General Mathematics, Chemistry (miscellaneous), Computer Science (miscellaneous)}}, number = {{3}}, publisher = {{MDPI AG}}, title = {{{Two-Colour Spectrally Multimode Integrated SU(1,1) Interferometer}}}, doi = {{10.3390/sym14030552}}, volume = {{14}}, year = {{2022}}, } @article{34094, author = {{Gao, Ying and Li, Yao and Ma, Xuekai and Gao, Meini and Dai, Haitao and Schumacher, Stefan and Gao, Tingge}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{20}}, publisher = {{AIP Publishing}}, title = {{{Tilting nondispersive bands in an empty microcavity}}}, doi = {{10.1063/5.0093908}}, volume = {{121}}, year = {{2022}}, } @article{47982, abstract = {{Spontaneous Raman spectroscopy (SR) is a versatile method for analysis and visualization of ferroelectric crystal structures, including domain walls. Nevertheless, the necessary acquisition time makes SR impractical for in situ analysis and large scale imaging. In this work, we introduce broadband coherent anti-Stokes Raman spectroscopy (B-CARS) as a high-speed alternative to conventional Raman techniques and demonstrate its benefits for ferroelectric domain wall analysis. Using the example of poled lithium niobate, we compare the spectral output of both techniques in terms of domain wall signatures and imaging capabilities. We extract the Raman-like resonant part of the coherent anti-Stokes signal via a Kramers–Kronig-based phase retrieval algorithm and compare the raw and phase-retrieved signals to SR characteristics. Finally, we propose a mechanism for the observed domain wall signal strength that resembles a Čerenkov-like behavior, in close analogy to domain wall signatures obtained by second-harmonic generation imaging. We, thus, lay here the foundations for future investigations on other poled ferroelectric crystals using B-CARS.}}, author = {{Reitzig, Sven and Hempel, Franz and Ratzenberger, Julius and Hegarty, Peter A. and Amber, Zeeshan H. and Buschbeck, Robin and Rüsing, Michael and Eng, Lukas M.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{16}}, publisher = {{AIP Publishing}}, title = {{{High-speed hyperspectral imaging of ferroelectric domain walls using broadband coherent anti-Stokes Raman scattering}}}, doi = {{10.1063/5.0086029}}, volume = {{120}}, year = {{2022}}, } @article{29780, abstract = {{A central tenet of theoretical cryptography is the study of the minimal assumptions required to implement a given cryptographic primitive. One such primitive is the one-time memory (OTM), introduced by Goldwasser, Kalai, and Rothblum [CRYPTO 2008], which is a classical functionality modeled after a non-interactive 1-out-of-2 oblivious transfer, and which is complete for one-time classical and quantum programs. It is known that secure OTMs do not exist in the standard model in both the classical and quantum settings. Here, we propose a scheme for using quantum information, together with the assumption of stateless (i.e., reusable) hardware tokens, to build statistically secure OTMs. Via the semidefinite programming-based quantum games framework of Gutoski and Watrous [STOC 2007], we prove security for a malicious receiver making at most 0.114n adaptive queries to the token (for n the key size), in the quantum universal composability framework, but leave open the question of security against a polynomial amount of queries. Compared to alternative schemes derived from the literature on quantum money, our scheme is technologically simple since it is of the "prepare-and-measure" type. We also give two impossibility results showing certain assumptions in our scheme cannot be relaxed.}}, author = {{Broadbent, Anne and Gharibian, Sevag and Zhou, Hong-Sheng}}, issn = {{2521-327X}}, journal = {{Quantum}}, keywords = {{Physics and Astronomy (miscellaneous), Atomic and Molecular Physics, and Optics}}, publisher = {{Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften}}, title = {{{Towards Quantum One-Time Memories from Stateless Hardware}}}, doi = {{10.22331/q-2021-04-08-429}}, volume = {{5}}, year = {{2021}}, } @article{34093, author = {{Riedl, Thomas and Kunnathully, V. S. and Trapp, A. and Langer, T. and Reuter, Dirk and Lindner, Jörg}}, issn = {{2475-9953}}, journal = {{Physical Review Materials}}, keywords = {{Physics and Astronomy (miscellaneous), General Materials Science}}, number = {{1}}, publisher = {{American Physical Society (APS)}}, title = {{{Strain-driven InAs island growth on top of GaAs(111) nanopillars}}}, doi = {{10.1103/physrevmaterials.4.014602}}, volume = {{4}}, year = {{2020}}, } @article{40271, author = {{Vergyris, Panagiotis and Babin, Charles and Nold, Raphael and Gouzien, Elie and Herrmann, Harald and Silberhorn, Christine and Alibart, Olivier and Tanzilli, Sébastien and Kaiser, Florian}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{2}}, publisher = {{AIP Publishing}}, title = {{{Two-photon phase-sensing with single-photon detection}}}, doi = {{10.1063/5.0009527}}, volume = {{117}}, year = {{2020}}, } @article{40381, abstract = {{Abstract The phenomenon of entanglement is the basis of quantum information and quantum communication processes. Entangled systems with a large number of photons are of great interest at present because they provide a platform for streaming technologies based on photonics. In this paper we present a device which operates with four-photons and based on the Hong–Ou–Mandel interference. The presented device allows to maximize the degree of spatial entanglement and generate the highly entangled four-dimensional Bell states. Furthermore, the use of the interferometer in different regimes leads to fast interference fringes in the coincidence probability with period of oscillations twice smaller than the pump wavelength. We have a good agreement between theoretical simulations and experimental results.}}, author = {{Ferreri, A and Ansari, V and Brecht, Benjamin and Silberhorn, Christine and Sharapova, Polina R.}}, issn = {{2058-9565}}, journal = {{Quantum Science and Technology}}, keywords = {{Electrical and Electronic Engineering, Physics and Astronomy (miscellaneous), Materials Science (miscellaneous), Atomic and Molecular Physics, and Optics}}, number = {{4}}, publisher = {{IOP Publishing}}, title = {{{Spatial entanglement and state engineering via four-photon Hong–Ou–Mandel interference}}}, doi = {{10.1088/2058-9565/abb411}}, volume = {{5}}, year = {{2020}}, } @article{39674, author = {{Atorf, B. and Rasouli, H. and Nordendorf, G. and Wilkes, D. and Kitzerow, Heinz-Siegfried}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{8}}, publisher = {{AIP Publishing}}, title = {{{Near infrared Kerr effect and description of field-induced phase transitions in polymer-stabilized blue phase liquid crystals}}}, doi = {{10.1063/1.4942604}}, volume = {{108}}, year = {{2016}}, } @article{38061, author = {{Schleich, Wolfgang P. and Ranade, Kedar S. and Anton, Christian and Arndt, Markus and Aspelmeyer, Markus and Bayer, Manfred and Berg, Gunnar and Calarco, Tommaso and Fuchs, Harald and Giacobino, Elisabeth and Grassl, Markus and Hänggi, Peter and Heckl, Wolfgang M. and Hertel, Ingolf-Volker and Huelga, Susana and Jelezko, Fedor and Keimer, Bernhard and Kotthaus, Jörg P. and Leuchs, Gerd and Lütkenhaus, Norbert and Maurer, Ueli and Pfau, Tilman and Plenio, Martin B. and Rasel, Ernst Maria and Renn, Ortwin and Silberhorn, Christine and Schiedmayer, Jörg and Schmitt-Landsiedel, Doris and Schönhammer, Kurt and Ustinov, Alexey and Walther, Philip and Weinfurter, Harald and Welzl, Emo and Wiesendanger, Roland and Wolf, Stefan and Zeilinger, Anton and Zoller, Peter}}, issn = {{0946-2171}}, journal = {{Applied Physics B}}, keywords = {{General Physics and Astronomy, Physics and Astronomy (miscellaneous), General Engineering}}, number = {{5}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Quantum technology: from research to application}}}, doi = {{10.1007/s00340-016-6353-8}}, volume = {{122}}, year = {{2016}}, } @article{39689, author = {{Wahle, Markus and Kitzerow, Heinz-Siegfried}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{20}}, publisher = {{AIP Publishing}}, title = {{{Electrically tunable zero dispersion wavelengths in photonic crystal fibers filled with a dual frequency addressable liquid crystal}}}, doi = {{10.1063/1.4936086}}, volume = {{107}}, year = {{2015}}, } @article{40398, author = {{Dyakonov, I V and Sharapova, Polina and Iskhakov, T Sh and Leuchs, G}}, issn = {{1612-2011}}, journal = {{Laser Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous), Instrumentation}}, number = {{6}}, publisher = {{IOP Publishing}}, title = {{{Direct Schmidt number measurement of high-gain parametric down conversion}}}, doi = {{10.1088/1612-2011/12/6/065202}}, volume = {{12}}, year = {{2015}}, } @article{38087, author = {{Covi, M. and Pressl, B. and Günthner, T. and Laiho, K. and Krapick, Stefan and Silberhorn, Christine and Weihs, G.}}, issn = {{0946-2171}}, journal = {{Applied Physics B}}, keywords = {{General Physics and Astronomy, Physics and Astronomy (miscellaneous), General Engineering}}, number = {{3}}, pages = {{489--495}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Liquid-nitrogen cooled, free-running single-photon sensitive detector at telecommunication wavelengths}}}, doi = {{10.1007/s00340-015-6019-y}}, volume = {{118}}, year = {{2015}}, } @article{39719, author = {{Vollbrecht, Joachim and Kasdorf, Olga and Quiring, Viktor and Suche, Hubertus and Bock, Harald and Kitzerow, Heinz-Siegfried}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{4}}, publisher = {{AIP Publishing}}, title = {{{Microresonator-enhanced electroluminescence of an organic light emitting diode based on a columnar liquid crystal}}}, doi = {{10.1063/1.4816425}}, volume = {{103}}, year = {{2013}}, } @article{40403, author = {{Sharapova, Polina and Tikhonova, O V}}, issn = {{1612-2011}}, journal = {{Laser Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous), Instrumentation}}, number = {{7}}, publisher = {{IOP Publishing}}, title = {{{Coherent control of interaction and entanglement of a Rydberg atom with few photons}}}, doi = {{10.1088/1612-2011/10/7/075204}}, volume = {{10}}, year = {{2013}}, } @article{39729, author = {{Atorf, B. and Hoischen, A. and Ros, M. B. and Gimeno, N. and Tschierske, C. and Dantlgraber, G. and Kitzerow, Heinz-Siegfried}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{22}}, publisher = {{AIP Publishing}}, title = {{{Switching performance of a polymer-stabilized antiferroelectric liquid crystal based on bent-core molecules}}}, doi = {{10.1063/1.4722794}}, volume = {{100}}, year = {{2012}}, }