@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{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{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{27099, abstract = {{In our work, we have engineered low capacitance single quantum dot photodiodes as sensor devices for the optoelectronic sampling of ultrafast electric signals. By the Stark effect, a time-dependent electric signal is converted into a time-dependent shift of the transition energy. This shift is measured accurately by resonant ps laser spectroscopy with photocurrent detection. In our experiments, we sample the laser synchronous output pulse of an ultrafast CMOS circuit with high resolution. With our quantum dot sensor device, we were able to sample transients below 20 ps with a voltage resolution in the mV-range.}}, author = {{Widhalm, Alex and Krehs, Sebastian and Siebert, Dustin and Sharma, Nand Lal and Langer, Timo and Jonas, Björn and Reuter, Dirk and Thiede, Andreas and Förstner, Jens and Zrenner, Artur}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{tet_topic_qd}}, pages = {{181109}}, title = {{{Optoelectronic sampling of ultrafast electric transients with single quantum dots}}}, doi = {{10.1063/5.0061358}}, volume = {{119}}, year = {{2021}}, } @article{17433, author = {{Wang, D. Q. and Reuter, Dirk and Wieck, A. D. and Hamilton, A. R. and Klochan, O.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Two-dimensional lateral surface superlattices in GaAs heterostructures with independent control of carrier density and modulation potential}}}, doi = {{10.1063/5.0009462}}, year = {{2020}}, } @article{17995, author = {{Riha, Christian and Buchholz, Sven S. and Chiatti, Olivio and Wieck, Andreas D. and Reuter, Dirk and Fischer, Saskia F.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Excess noise in Al x Ga 1 − xAs/GaAs based quantum rings}}}, doi = {{10.1063/5.0002247}}, year = {{2020}}, } @article{17322, author = {{Mukherjee, Amlan and Widhalm, Alex and Siebert, Dustin and Krehs, Sebastian and Sharma, Nandlal and Thiede, Andreas and Reuter, Dirk and Förstner, Jens and Zrenner, Artur}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{tet_topic_qd}}, pages = {{251103}}, title = {{{Electrically controlled rapid adiabatic passage in a single quantum dot}}}, doi = {{10.1063/5.0012257}}, volume = {{116}}, 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{21029, author = {{Allgaier, Markus and Ansari, Vahid and Eigner, Christof and Quiring, Viktor and Ricken, Raimund and Donohue, John Matthew and Czerniuk, Thomas and Aßmann, Marc and Bayer, Manfred and Brecht, Benjamin and Silberhorn, Christine}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Streak camera imaging of single photons at telecom wavelength}}}, doi = {{10.1063/1.5004110}}, volume = {{112}}, year = {{2018}}, } @article{23630, author = {{Liu, Ning and Steinrück, Hans-Georg and Osvet, Andres and Yang, Yuyun and Schmuki, Patrik}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, pages = {{072102}}, title = {{{Noble metal free photocatalytic H2 generation on black TiO2: On the influence of crystal facets vs. crystal damage}}}, doi = {{10.1063/1.4976010}}, volume = {{110}}, year = {{2017}}, } @article{13361, author = {{Lafont, O. and Luk, S. M. H. and Lewandowski, P. and Kwong, N. H. and Leung, P. T. and Galopin, E. and Lemaitre, A. and Tignon, J. and Schumacher, Stefan and Baudin, E. and Binder, R.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Controlling the optical spin Hall effect with light}}}, doi = {{10.1063/1.4975681}}, year = {{2017}}, } @article{22568, author = {{Layes, V. and Monje, S. and Corbella, C. and Trieschmann, J. and de los Arcos de Pedro, Maria Teresa and von Keudell, A.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Species transport on the target during high power impulse magnetron sputtering}}}, doi = {{10.1063/1.4976999}}, year = {{2017}}, } @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{4237, abstract = {{We report the fabrication of periodically poled domain patterns in x-cut lithium niobate thin-film. Here, thin films on insulator have drawn particular attention due to their intrinsic waveguiding properties offering high mode confinement and smaller devices compared to in-diffused waveguides in bulk material. In contrast to z-cut thin film lithium niobate, the x-cut geometry does not require back electrodes for poling. Further, the x-cut geometry grants direct access to the largest nonlinear and electro-optical tensor element, which overall promises smaller devices. The domain inversion was realized via electric field poling utilizing deposited aluminum top electrodes on a stack of LN thin film/SiO2 layer/Bulk LN, which were patterned by optical lithography. The periodic domain inversion was verified by non-invasive confocal second harmonic microscopy. Our results show domain patterns in accordance to the electrode mask layout. The second harmonic signatures can be interpreted in terms of spatially, overlapping domain filaments which start their growth on the þz side.}}, author = {{Mackwitz, P. and Rüsing, Michael and Berth, Gerhard and Widhalm, A. and Müller, K. and Zrenner, Artur}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{15}}, publisher = {{AIP Publishing}}, title = {{{Periodic domain inversion in x-cut single-crystal lithium niobate thin film}}}, doi = {{10.1063/1.4946010}}, volume = {{108}}, year = {{2016}}, } @article{7217, author = {{Jostmeier, Thorben and Wecker, Tobias and Reuter, Dirk and As, Donat Josef and Betz, Markus}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{21}}, publisher = {{AIP Publishing}}, title = {{{Ultrafast carrier dynamics and resonant inter-miniband nonlinearity of a cubic GaN/AlN superlattice}}}, doi = {{10.1063/1.4936330}}, volume = {{107}}, year = {{2015}}, } @article{7221, author = {{Chen, J. C. H. and Klochan, O. and Micolich, A. P. and Das Gupta, K. and Sfigakis, F. and Ritchie, D. A. and Trunov, K. and Reuter, Dirk and Wieck, A. D. and Hamilton, A. R.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{18}}, publisher = {{AIP Publishing}}, title = {{{Fabrication and characterisation of gallium arsenide ambipolar quantum point contacts}}}, doi = {{10.1063/1.4918934}}, volume = {{106}}, year = {{2015}}, } @article{4331, abstract = {{We report about the fabrication and analysis of high Q photonic crystal cavities with metallic Schottky-contacts. The structures are based on GaAs n-i membranes with an InGaAs quantum well in the i-region and nanostructured low ohmic metal top-gates. They are designed for photocurrent readout within the cavity and fast electric manipulations. The cavity structures are characterized by photoluminescence and photocurrent spectroscopy under resonant excitation. We find strong cavity resonances in the photocurrent spectra and surprisingly high Q-factors up to 6500. Temperature dependent photocurrent measurements in the region between 4.5K and 310K show an exponential enhancement of the photocurrent signal and an external quantum efficiency up to 0.26.}}, author = {{Quiring, W. and Al-Hmoud, M. and Rai, A. and Reuter, Dirk and Wieck, A. D. and Zrenner, Artur}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{4}}, publisher = {{AIP Publishing}}, title = {{{Photonic crystal cavities with metallic Schottky contacts}}}, doi = {{10.1063/1.4928038}}, volume = {{107}}, year = {{2015}}, } @article{6524, abstract = {{We use a picosecond acoustics technique to modulate the laser output of electrically pumped GaAs/AlAs micropillar lasers with InGaAs quantum dots. The modulation of the emission wavelength takes place on the frequencies of the nanomechanical extensional and breathing (radial) modes of the micropillars. The amplitude of the modulation for various nanomechanical modes is different for every micropillar which is explained by a various elastic contact between the micropillar walls and polymer environment.}}, author = {{Czerniuk, T. and Tepper, J. and Akimov, A. V. and Unsleber, S. and Schneider, C. and Kamp, M. and Höfling, S. and Yakovlev, D. R. and Bayer, M.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, number = {{4}}, publisher = {{AIP Publishing}}, title = {{{Impact of nanomechanical resonances on lasing from electrically pumped quantum dot micropillars}}}, doi = {{10.1063/1.4906611}}, volume = {{106}}, year = {{2015}}, }