14 Apr 2020
D. Karnaushenko, T. Kang, V. K. Bandari, F. Zhu, O. G. Schmidt
20 Mar 2020
Our work on the smallest microelectronic robot actuated and controlled by wireless power has been highlighted as cover story in Nature Electronics. The work has also been subject in the issue’s Editorial and News & Views.
25 Feb 2020
Hybrid sperm micromotors actively swim against continuous and pulsatile blood. They swim alone or in trains, and they can deliver heparin cargo to prevent blood clotting.
22 Jan 2020
Together with Osaka University we have demonstrated the first fully functional imperceptible magnetic sensor matrix system based on flexible organic thin-film transistor technology – the most seamless, complex, and high-functioning system of its kind to date.
20 Dec 2019
Self-assembly is used to simultaneously reorient giant magnetoresistive spin valve sensors in 3D magnetic angular encoders.
25 Oct 2019
The nanostructures and dynamics of thin water layers on oxide are revealed by optical whispering-gallery-mode resonances in a microtube cavity.
16 Oct 2019
The transfer of entanglement between distant photons generated by semiconductor quantum dots has been realized for the first time, representing a major step towards secure communication and long-range quantum state transfer.
26 Aug 2019
An integratable 3D microtubular asymmetric supercapacitor with ultrahigh energy density, long-term cycling stability and excellent mechanical performance is fabricated by modern on-chip microfabrication technologies and self-assembly procedures.
14 Aug 2019
Opto-acoustic imaging is used to track microtubular robots in three dimensions, in real-time, in deep phantom and ex-vivo tissue.
8 Jul 2019
Ancient art of paper-folding inspires new technology to create high performance microdevices.
5 Jul 2019
Tubular micro-supercapacitors with greatly reduced footprint area, improved electrochemical performance and self-protective function are created by self-assembling 2D films into “swiss roll” architectures.
19 Jun 2019
V. K. Bandari, Y. Gu, S. Shi, Y. Nan, K. He, Y. Li, N. Bandari, S. Moradi, H. Tian, F. Zhu, Y. Geng, D. Yan, O. G. Schmidt
9 Nov 2018
D. D. Karnaushenko, D. Karnaushenko, H.‐J. Grafe, V. Kataev, B. Büchner, O. G. Schmidt
31 Jul 2018
New broadband optical antenna for highly efficient extraction of entangled photons with a yield of 37% per pulse.
9 Apr 2018
In situ generation of silver nanoparticles for selective coupling between localized plasmonic resonances and whispering-gallery modes is demonstrated by spatially resolved laser dewetting on microtube surfaces.
15 Jan 2018
The Spermbot video has now become the 5th most viewed video of the American Chemical Society. Click on the following link to watch it.
4 Dec 2017
A sperm-driven micromotor acts as a targeted drug delivery system to potentially treat diseases in the female reproductive tract.
3 Aug 2017
Thermal conductivities through radial and planar Si/SiOx hybrid superlattices are substantially reduced -- putting forth a novel efficient way of managing phonon transport in Si-based devices.
26 May 2017
Epitaxial GaAs quantum dots are optimized to such a degree that all of them emit entangled photons on demand upon illumination with light.
A property that may prove relevant for quantum communication technologies.
24 May 2017
In this extended comment we call on microrobotics researchers, materials scientists, bioimaging and medical specialists to work together to tackle the challenges on the way to in-vivo applications.
21 Mar 2017
V. Magdanz, M. Medina-Sánchez, L. Schwarz, H. Xu, J. Elgeti, O. G. Schmidt
24 Jan 2017
Monolithically integrated vertical ring resonators pave the way for optofluidics in three-dimensions on photonic chips.
30 Aug 2016
The single photon emission from a single III-V quantum dot (QD) is tuned into resonance with that of another QD by a fully Si-integrated MEMS platform .
23 Jun 2016
Selective coupling of localized surface plasmons and resonant optical modes is achieved in cleverly patterned microtubular optical cavities.
6 Jun 2016
Microtubular sensor reaches attomolar level detection of Avian Influenza Virus H1N1 DNA without any labelling or amplification.
6 Jun 2016
Tumor cell devision is mimicked inside blood capillaries by investigating single-cell mitosis of living human cancer cells trapped inside rolled-up microtubes.
18 Mar 2016
We enable spin-orbit coupling of light confined to a closed path within an asymmetric optical microcavity and demonstrate a non-cyclic Berry phase acquired in a non-Abelian evolution.
18 Feb 2016
Organic diodes consisting of molecular nano-pyramid structures demonstrate high average sensitivity (151% ppm−1) and fast recovery time (12 min) for NO2 detection.
27 Jan 2016
With a silicon MEMS device we shift the entangled photon emission from a quantum dot by more than 3000 times of its radiative linewidth without spoiling the entanglement.
21 Dec 2015
Magnetically activated microhelices serve as motors for transporting sperm cells with motion deficiencies to help them carry out their natural function.
30 Nov 2015
S. K. Srivastava, M. Medina-Sánchez, B. Koch, O. G. Schmidt
We present efficient wastewater-mediated activation of catalytic micromotors for the degradation of nitroaromatic pollutants in water.
We demonstrate strain-tunable entangled-light-emitting-diodes operating at frequencies up to 400 MHz and entanglement fidelities as high as 0.83.
D. Karnaushenko, N. Münzenrieder, D. D. Karnaushenko, B. Koch, A. K. Meyer, S. Baunack, L. Petti, G. Tröster, D. Makarov, O. G. Schmidt
Arrays of rolled-up on-chip-integrated giant magneto-impedance (GMI) sensors equipped with pick-up coils are demonstrated.
We provide new insights into the physics of the fundamentally-appealing magnetoelectric Cr2O3 and application-relevant IrMn antiferromagnets.
We exploit the well-defined geometry and optical transparency of glass microtubes to investigate how scaffold dimensionality and cell confinement influence the spontaneous migration of neural stem cells.
We demonstrate full integration of vertical optical ring resonators with silicon nanophotonic waveguides on silicon-on-insulator substrates to accomplish a significant step towards 3D photonic integration.
Ultra-compact helical antennas with a total length five times smaller compared to their conventional dipole counterparts are demonstrated to operate in the Industry-Scientific-Medical radio band.
We demonstrate that the magnetic Möbius ring is a unique object because it unites two classes of geometrical effects, namely, topologically induced magnetization patterning and curvature induced chirality symmetry breaking.
We have developed an electronic skin with a magneto-sensory system that equips the recipient with a “sixth sense” able to perceive the presence of static or dynamic magnetic fields.
M. Melzer, D. Karnaushenko, G. Lin, S. Baunack, D. Makarov, O. G. Schmidt
We use micropatterning and strain engineering to encapsulate single living mammalian cells into transparent tubular architectures consisting of 3D rolled-up nanomembranes.
Hybrid superlattices consisting of a large number of nanomembranes mechanically stacked on top of each other are fabricated by a roll-up and press-back technique.
R. Sharma, C. C. Bof Bufon, D. Grimm, R. Sommer, A. Wollatz, J. Schadewald, D. J. Thurmer, P. F. Siles, M. Bauer, O. G. Schmidt
Ultracompact three-dimensional tubular structures integrating Au-based electrodes serve as impedimetric microsensors for the in-flow determination of mono- and divalent ionic species and HeLa cells.
Flexible self-propelled microjets are formed by temperature-induced folding of thin polymer films into microtubes that contain an inner platinum layer for catalytic bubble propulsion in hydrogen peroxide.
Rolled-up magnetic microtubes display spiral-like, longitudinally or azimuthally magnetized domain patterns.
We demonstrate the creation of a light-hole exciton ground state by applying elastic stress to an initially unstrained quantum dot.
The first all-electrically operated wavelength-tunable single-photon source is demonstrated.
We employed rolled-up nanotechnology to fabricate sandwich-stacked SnO2/Cu hybrid nanosheets as multichannel anodes for lithium-ion batteries with the use of carbon black as inter-sheet spacer.
A significant step towards integrated vertically rolled-up microcavities is demonstrated by interfacing SiO2 microtube optical ring resonators with tapered fibers.
Dr. L. Baraban, Dr. S. M. Harazim, Dr. S. Sanchez, Prof. Dr. O. G. Schmidt
A novel method for the fabrication of diamond lattice photonic crystals with full band gap by rolling strained pre-patterned titania membranes is proposed.
Dynamic molecular processes of water and ethanol are detected on the surface of rolled-up opto-chemical microtube resonators.
We report about a new type of tubular configuration for excellent battery electrode performance made from naturally rolled-up C/Si/C trilayer nanomembranes.
We fabricate inorganic thin film transistors with bending radii of less than 5μm maintaining their high electronic performance with on-off ratios of more than 100.000 and subthreshold swings of 160mV/dec.
We demonstrate experimentally and theoretically that it is always possible to restore the excitonic degeneracy in quantum dots by the simultaneous application of large strain and electric fields.
We report the self-assembled growth of Ge nanowires with a height of only 3 unit cells and a length of up to 2 micrometers by means of molecular beam epitaxy.
Stretchable magnetoelectronic devices are demonstrated for the first time.
In this work, we address curvature-driven modifications of magnetic properties in confined cylindrically curved magnetic nanomembranes.
D. Karnaushenko, D. Makarov, C. Yan, R. Streubel, O. G. Schmidt
We present a conceptually new approach for the detection of magnetic objects flowing through a fluidic channel.
We design nanoscale tools in the form of autonomous and remotely guided catalytically self-propelled rolled-up tubes.
S. M. Harazim, W. Xi, C. K. Schmidt, S. Sanchez, O. G. Schmidt
We theoretically apply transport currents and magnetic fields to open superconducting tubes.
We present the first nanomembrane quantum-light-emitting diodes (QLEDs) integrated onto piezoelectric actuators.
The advances we have made in engineering of tubular optical sensors and their on-chip integration allows us to fabricate rolled-up optofluidic ring resonators based on glass material with high quality factors fully integrated on-chip.
A lab-in-a-tube device comprises numerous ultracompact components in a single tube which can be developed using rolled-up technology.
E. J. Smith, S. Schulze, S. Kiravittaya, Y. Mei, S. Sanchez, O. G. Schmidt
We design and investigate three-dimensional microhelix coil structures that are radial-, corkscrew-, and hollow-bar-magnetized.
Rolled-up nanotech is used to fabricate magnetic sensor devices, which are directly integrated into fluidic architectures.
We report the tuning of the propulsion power of catalytic microjets through illumination of a solution by a white-light source.
We fabricate microjet engines that acquire superfast speeds of 10 mm sec-1.
In this tutorial review we describe recent progress on catalytic microtubular engines fabricated by rolled-up nanotech.
"The smallest man-made jet engine measures just 600nm across and weighs 1 picogram.
The motion of artificial catalytic nanomachines is commonly studied in free bulk solution, which differs significantly from the stream-like channel networks existing in the human body.
Animal cells can be transported within a fluid in a controllable manner by using artificial microbots.
We observe that spin-selective tunnel rates through individual quantum dots can be achieved with normal metallic contacts.
We combine self-assembly and top-down methods to create hybrid junctions consisting of single organic molecular monolayers sandwiched between metal and/or single-crystalline semiconductor nanomembrane based electrodes.
We have exploited the card-board effect on the nanoscale to define the roll-up direction of ultra-thin membranes on a substrate surface.
By guiding the emitted light of quantum dots through atom vapor the speed of the photons is reduced to less than 4% of the speed of light in vacuum.
Optofluidic microcavities from rolled-up ring resonators with subwavelength wall thicknesses are fabricated with excellent sensing function.
H.‐X. Ji, X.‐L. Wu, L.‐Z. Fan, C. Krien, I. Fiering, Y.‐G. Guo, Y. Mei, O. G. Schmidt
We demonstrate the self-assembly of ultra-compact energy storage devices based on self-wound three-dimensional hybrid organic/inorganic nanomembranes.
We demonstrate a redox Swiss roll micro-supercapacitor consisting of a self-rolled multilayered nanomembrane with an electrochemical active layer at either the outer or inner surface for different proton diffusion paths.
Primary mouse motor neurons and immortalised CAD cells, a cell line derived from the central nervous system, can be well cultured on arrays of rolled-up microtubes.
Quantum dots are able to cope with increasing stress by cyclically incorporating large amounts of material from the substrate and corresponding changes of their shape.
J. Dong, T. Zhang, Y. Zhang, L. Yang, R. Lu
Artificial autonomous systems act as catalytic water striders at the air–liquid interface of hydrogen peroxide solution.
We have designed a novel hybrid biocatalytic microengine.
A. A. Solovev, S. Sanchez, M. Pumera, Y. F. Mei, O. G. Schmidt
On May 18, 2001 a patent to speed up Si transistors was filed by Schmidt and Eberl (US 6,498,359), which relies on a SiGe dot positioned below the channel of a Si transistor. This idea was now realized.
Mesoscopic Josephson junctions are developed simply relying on natural metallic film roughnesses, self-assembly and standard optical lithography.
Under local illumination, ultrathin silicon nanomembranes on insulator reveal a gate-controlled photovoltaic effect and negative transconductance in Schottky transistors applying both homo- and hetero-contacts.
We have realized single-hole transistors based on self-assembled SiGe quantum dots.
We are continuously expanding the knowledge of how controllable external stresses, as a basic physical technique, modify the properties and unveil interesting physics of nanomaterials.
We have fabricated sub-micrometer light emitting diodes in a mesoscopic semiconductor structure by means of a focused laser beam.
Elastic mechanical strain is a powerful control tool for engineering the electronic states in quantum dots.
Introducing Ge nanostructures into single-crystalline Si leads to thermal conductivities which are lower than any other SiGe alloy, amorphous Si and even glass.
An investigation of the material makeup and surrounding medium of an optical rolled-up hyperlens is presented.
Detailed investigations of individual yeast cells in a single transparent microtube reveal the mechanical interaction between the tube and the 2D confined cells causing different cellular assemblies.
We have presented an overview on approaches currently employed to fabricate advanced quantum dot configurations by epitaxial growth.
Wir haben winzige Mikroraketen hergestellt, die sich durch ein Magnetfeld fernsteuern lassen.
We observe giant persistent photoconductivity from rough Si nanomembranes.
Arrays of GaAs microring optical resonators with embedded quantum dots are placed on top of piezoelectric actuators, which allow the microcavities to be reversibly “stretched” or “squeezed” by applying relatively large biaxial stresses at low temperatures.
We have studied quantum dots for which the wetting layer thickness can be arbitrarily controlled.
Y. Mei, D. J. Thurmer, C. Deneke, S. Kiravittaya, Y.-F. Chen, A. Dadgar, F. Bertram, B. Bastek, A. Krost, J. Christen, T. Reindl, M. Stoffel, E. Coric†, O. G. Schmidt
L. Wang, A. Rastelli, S. Kiravittaya, M. Benyoucef, O. G. Schmidt
We have explored the change-over from wrinkling to rolling for compressively strained thin solid films.
We have invented an entirely new approach to create hybrid material layer stacks, which cannot be produced by any other technology.
The tunability of optical resonant modes of spiral microtube cavities, rolled-up from square patterned SiO/SiO2 thin nanomembranes on glass substrates, is demonstrated experimentally by coating the tube walls by atomic layer deposition.
G. S. Huang, S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding, M. Benyoucef, A. Rastelli1, Y. F. Mei, O. G. Schmidt
In this work, we present steps towards the realization of quantum interference between two photons emitted from two independent QDs.
we demonstrate triggered single-photon emission from a single quantum dot grown on Si substrate for the first time.
Magnetic rolled-up microtubes are fabricated for the first time, and their hysteresis curves are measured.
Strongly enhanced GMR on flexible substrates is reported for Co/Cu multilayers deposited on plastics by introducing a photoresist buffer layer.
Y. Mei, G. Huang, A. A. Solovev, E. Bermúdez Ureña, I. Mönch, F. Ding, T. Reindl, R. K. Y. Fu, P. K. Chu, O. G. Schmidt
In analogy to a conventional crystal we have introduced the terminology and formation of vacancy and interstitial defects in artificial crystals.
We demonstrate that gentle grooves on a Si substrate "attract" self-assembled SiGe quantum dots and provide a way to control their position on the substrate.
We control the nucleation sites of quantum dots by small pit patterns on the substrate surface.
We have developed a simple “nanotomography” approach based on scanning probe microscopy and selective wet chemical etching.
Integrated ohmic devices are fabricated from Si-based microtubes, and linear I-V curves are measured for rolled-up tubes suspended between two electrodes.
A. Malachias, Y. Mei, R. K. Annabattula, C. Deneke, P. R. Onck, O. G. Schmidt
We use Si/SiO microtubes as optofluidic components to sense glucose concentrations in water.
A focused laser beam is used both as optical excitation and local heat source to obtain strong coupling in photonic molecules.
Quantum dots constitute a natural template to construct refined artificial matter, such as artificial atoms, molecules and possibly artificial crystals with entirely new electronic and optical properties.
Periodic metal patterns on a silicon surface provide unprecedented control over the morphology of highly ordered Ge islands.
We have developed a method that exploits the deterministic wrinkling and a subsequent bond-back of a semiconductor layer to create well-defined and versatile nanochannel networks.
Strained rolled-up heterostructures allow for the creation of radial superlattices incorporating crystalline and non-crystalline material.
The strain state of a wrinkled nanomembrane has been accurately analyzed by incorporating a quantum well into the layer and subsequently using micro-photoluminescence to investigate the shift of the transition energy.
Laser processing is used as a post-growth method to tune, within a broad spectral range and with resolution-limited accuracy, the confined energy states of single quantum dots.
Rolled-up Si/SiO tubes show optically resonant emission in the visible spectral range at room temperature.
We have succeeded in the fabrication of high quality InAs/GaAs quantum dots with degenerate exciton recombination and shown that quantum correlated photon pairs can be produced at temperatures as high as 30 K.
