9 Nov 2018
D. D. Karnaushenko, D. Karnaushenko, H.‐J. Grafe, V. Kataev, B. Büchner, O. G. Schmidt
Adv. Electron. Mater. 4, 1800298 (2018)
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31 Jul 2018
New broadband optical antenna for highly efficient extraction of entangled photons with a yield of 37% per pulse.
Press Release
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.
ACS Nano 12, 3726 (2018)
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.
YouTube Video
4 Dec 2017
A sperm-driven micromotor acts as a targeted drug delivery system to potentially treat diseases in the female reproductive tract.
ACS Nano 12, 327 (2018)
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.
ACS Nano 11, 8215 (2017)
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.
Nature 545, 406 (2017)
21 Mar 2017
V. Magdanz, M. Medina-Sánchez, L. Schwarz, H. Xu, J. Elgeti, O. G. Schmidt
Adv. Mater. 29, 1606301 (2017)
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24 Jan 2017
Monolithically integrated vertical ring resonators pave the way for optofluidics in three-dimensions on photonic chips.
Opt. Lett. 42, 486 (2017)
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 .
Nano Lett. 16, 5785 (2016)
23 Jun 2016
Selective coupling of localized surface plasmons and resonant optical modes is achieved in cleverly patterned microtubular optical cavities.
Phys. Rev. Lett. 116, 253904 (2016)
6 Jun 2016
Microtubular sensor reaches attomolar level detection of Avian Influenza Virus H1N1 DNA without any labelling or amplification.
Nano Lett. 16, 4288 (2016)
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.
ACS Nano 10, 5835 (2016)
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.
Nature Comm. 7, 10983 (2016)
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.
Adv. Mater. 28, 2971 (2016)
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.
Nature Commun. 7, 10387 (2016)
21 Dec 2015
Magnetically activated microhelices serve as motors for transporting sperm cells with motion deficiencies to help them carry out their natural function.
Nano Lett. 16, 555 (2016)
30 Nov 2015
S. K. Srivastava, M. Medina-Sánchez, B. Koch, O. G. Schmidt
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We present efficient wastewater-mediated activation of catalytic micromotors for the degradation of nitroaromatic pollutants in water.
Nano Lett. 16, 817 (2016)
We demonstrate strain-tunable entangled-light-emitting-diodes operating at frequencies up to 400 MHz and entanglement fidelities as high as 0.83.
Nature Comm. 6, 10067 (2015)
D. Karnaushenko, N. Münzenrieder, D. D. Karnaushenko, B. Koch, A. K. Meyer, S. Baunack, L. Petti, G. Tröster, D. Makarov, O. G. Schmidt
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Arrays of rolled-up on-chip-integrated giant magneto-impedance (GMI) sensors equipped with pick-up coils are demonstrated.
Adv. Mater. 27, 6582 (2015)
We provide new insights into the physics of the fundamentally-appealing magnetoelectric Cr2O3 and application-relevant IrMn antiferromagnets.
Phys. Rev. Lett. 115, 097201 (2015)
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.
Nano Lett. 15, 5530 (2015)
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.
Opt. Lett. 40, 3826 (2015)
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.
NPG Asia Mater. 7, e188 (2015)
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.
Phys. Rev. Lett. 114, 197204 (2015)
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.
Nature Communications 6, 6080 (2015)
M. Melzer, D. Karnaushenko, G. Lin, S. Baunack, D. Makarov, O. G. Schmidt
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We use micropatterning and strain engineering to encapsulate single living mammalian cells into transparent tubular architectures consisting of 3D rolled-up nanomembranes.
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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.
Nano Lett. 14, 2837 (2014)
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
Adv. Energy Mater. 4, 1301631 (2014)
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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.
Nano Lett. 14, 2219 (2014)
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.
Angew. Chem. Int. Ed. 53, 2673 (2014)
Rolled-up magnetic microtubes display spiral-like, longitudinally or azimuthally magnetized domain patterns.
Adv. Mater. 26, 316 (2014)
We demonstrate the creation of a light-hole exciton ground state by applying elastic stress to an initially unstrained quantum dot.
Nat. Phys. 10, 46 (2014)
The first all-electrically operated wavelength-tunable single-photon source is demonstrated.
Nano Lett. 13, 5808 (2013)
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.
ACS Nano 7, 6948 (2013)
A significant step towards integrated vertically rolled-up microcavities is demonstrated by interfacing SiO2 microtube optical ring resonators with tapered fibers.
Appl. Phys. Lett. 102, 251119 (2013)
Dr. L. Baraban, Dr. S. M. Harazim, Dr. S. Sanchez, Prof. Dr. O. G. Schmidt
Angew. Chem. Int. Edit. 52, 5552 (2013)
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A novel method for the fabrication of diamond lattice photonic crystals with full band gap by rolling strained pre-patterned titania membranes is proposed.
Phys. Rev. A. 87, 041803 (2013)
Dynamic molecular processes of water and ethanol are detected on the surface of rolled-up opto-chemical microtube resonators.
Adv. Mater. 25, 2357 (2013)
We report about a new type of tubular configuration for excellent battery electrode performance made from naturally rolled-up C/Si/C trilayer nanomembranes.
Angew. Chem. Int. Edit. 52, 2326 (2013)
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.
Nano Lett. 13, 213 (2013)
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.
Phys. Rev. Lett. 109, 147401 (2012)
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.
Phys. Rev. Lett. 109, 085502 (2012)
Stretchable magnetoelectronic devices are demonstrated for the first time.
Nano Lett. 11, 2522 (2011)
In this work, we address curvature-driven modifications of magnetic properties in confined cylindrically curved magnetic nanomembranes.
Nano Lett. 12, 3961 (2012)
D. Karnaushenko, D. Makarov, C. Yan, R. Streubel, O. G. Schmidt
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We present a conceptually new approach for the detection of magnetic objects flowing through a fluidic channel.
RSC Adv. 2, 2284 (2012)
We design nanoscale tools in the form of autonomous and remotely guided catalytically self-propelled rolled-up tubes.
ACS Nano 6, 1751 (2012)
S. M. Harazim, W. Xi, C. K. Schmidt, S. Sanchez, O. G. Schmidt
J. Mater. Chem. 22, 2878 (2012)
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We theoretically apply transport currents and magnetic fields to open superconducting tubes.
Nano Lett. 12, 1282 (2012)
We present the first nanomembrane quantum-light-emitting diodes (QLEDs) integrated onto piezoelectric actuators.
Adv. Mater. 24, 2668–2672 (2012)
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.
Lab Chip 12, 2649 (2012)
A lab-in-a-tube device comprises numerous ultracompact components in a single tube which can be developed using rolled-up technology.
Lab Chip 12, 1917 (2012)
E. J. Smith, S. Schulze, S. Kiravittaya, Y. Mei, S. Sanchez, O. G. Schmidt
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We design and investigate three-dimensional microhelix coil structures that are radial-, corkscrew-, and hollow-bar-magnetized.
Phys. Rev. Lett. 107, 097204 (2011)
Rolled-up nanotech is used to fabricate magnetic sensor devices, which are directly integrated into fluidic architectures.
ACS Nano 5, 7436 (2011)
We report the tuning of the propulsion power of catalytic microjets through illumination of a solution by a white-light source.
Angew. Chem. Int. Edit. 50, 10875–10878 (2011)
We fabricate microjet engines that acquire superfast speeds of 10 mm sec-1.
J. Am. Chem. Soc. 133, 14860 (2011)
In this tutorial review we describe recent progress on catalytic microtubular engines fabricated by rolled-up nanotech.
Chem. Soc. Rev. 40, 2109 (2011)
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"The smallest man-made jet engine measures just 600nm across and weighs 1 picogram.
Die Welt (March 8, 2011)
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.
J. Am. Chem. Soc. 133, 701 (2011)
Animal cells can be transported within a fluid in a controllable manner by using artificial microbots.
Chem. Commun. 47, 698-700 (2011)
We observe that spin-selective tunnel rates through individual quantum dots can be achieved with normal metallic contacts.
Phys. Rev. Lett. 107, 246601 (2011)
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.
Nano Lett. 11, 3727 (2011)
We have exploited the card-board effect on the nanoscale to define the roll-up direction of ultra-thin membranes on a substrate surface.
Nano Lett. 11, 236 (2011)
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.
Nat. Photonics 5, 230 (2011)
Optofluidic microcavities from rolled-up ring resonators with subwavelength wall thicknesses are fabricated with excellent sensing function.
ACS Nano 4, 3123 (2010)
H.‐X. Ji, X.‐L. Wu, L.‐Z. Fan, C. Krien, I. Fiering, Y.‐G. Guo, Y. Mei, O. G. Schmidt
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We demonstrate the self-assembly of ultra-compact energy storage devices based on self-wound three-dimensional hybrid organic/inorganic nanomembranes.
Nano Lett. 10, 2506 (2010)
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.
Chem. Commun. 46, 3881 (2010)
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.
Adv. Eng. Mater. 12, B558 (2010)
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.
Phys. Rev. Lett. 105, 166102 (2010)
J. Dong, T. Zhang, Y. Zhang, L. Yang, R. Lu
Appl. Phys. Lett. 96, 193101 (2010)
Artificial autonomous systems act as catalytic water striders at the air–liquid interface of hydrogen peroxide solution.
Adv. Mater. 22, 4340 (2010)
We have designed a novel hybrid biocatalytic microengine.
J. Am. Chem. Soc. 132, 13144 (2010)
A. A. Solovev, S. Sanchez, M. Pumera, Y. F. Mei, O. G. Schmidt
Adv. Funct. Mater. 20, 2430 (2010)
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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.
IEEE Electron Device Lett. 31, 1083 (2010)
Mesoscopic Josephson junctions are developed simply relying on natural metallic film roughnesses, self-assembly and standard optical lithography.
Nano Lett. 10, 3704 (2010)
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.
Adv. Mater. 22, 3667 (2010)
We have realized single-hole transistors based on self-assembled SiGe quantum dots.
Nat. Nanotechnol. 5, 458 (2010)
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.
Nano Lett. 10, 3453 (2010)
We have fabricated sub-micrometer light emitting diodes in a mesoscopic semiconductor structure by means of a focused laser beam.
Adv. Mater. 22, 3176 (2010)
Elastic mechanical strain is a powerful control tool for engineering the electronic states in quantum dots.
Phys. Rev. Lett. 104, 067405 (2010)
Introducing Ge nanostructures into single-crystalline Si leads to thermal conductivities which are lower than any other SiGe alloy, amorphous Si and even glass.
Nat. Mater. 9, 491 (2010)
An investigation of the material makeup and surrounding medium of an optical rolled-up hyperlens is presented.
Applied Physics Letters 95, 083104 (2009)
Applied Physics Letters 96, 019902 (2010)
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.
Lab Chip 9, 263-268 (2009)
We have presented an overview on approaches currently employed to fabricate advanced quantum dot configurations by epitaxial growth.
Rep. Prog. Phys. 72, 046502 (2009)
Wir haben winzige Mikroraketen hergestellt, die sich durch ein Magnetfeld fernsteuern lassen.
Spektrum der Wissenschaft, S.16, Juli 2009
Welt der Physik 16.05.2009
We observe giant persistent photoconductivity from rough Si nanomembranes.
Nano Lett. 9, 3453 (2009)
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.
Opt. Express 17, 22452 (2009)
We have studied quantum dots for which the wetting layer thickness can be arbitrarily controlled.
Phys. Rev. B 80, 085309 (2009)
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
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L. Wang, A. Rastelli, S. Kiravittaya, M. Benyoucef, O. G. Schmidt
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We have explored the change-over from wrinkling to rolling for compressively strained thin solid films.
Phys. Rev. B 79, 085429 (2009)
We have invented an entirely new approach to create hybrid material layer stacks, which cannot be produced by any other technology.
Appl. Phys. Lett. 94, 053102 (2009)
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.
Opt. Lett. 34, 2345 (2009)
G. S. Huang, S. Kiravittaya, V. A. Bolaños Quiñones, F. Ding, M. Benyoucef, A. Rastelli1, Y. F. Mei, O. G. Schmidt
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In this work, we present steps towards the realization of quantum interference between two photons emitted from two independent QDs.
Appl. Phys. Lett. 95, 261908 (2009)
we demonstrate triggered single-photon emission from a single quantum dot grown on Si substrate for the first time.
Nano Lett. 9, 304–307 (2009)
Magnetic rolled-up microtubes are fabricated for the first time, and their hysteresis curves are measured.
Nanotechnology 20, 045703 (2009)
Phys. Status Solidi C 5, 2704 (2008)
Strongly enhanced GMR on flexible substrates is reported for Co/Cu multilayers deposited on plastics by introducing a photoresist buffer layer.
Adv. Mater. 20, 3224 (2008)
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
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In analogy to a conventional crystal we have introduced the terminology and formation of vacancy and interstitial defects in artificial crystals.
Appl. Phys. Lett. 93, 173109 (2008)
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.
Phys. Rev. Lett. 101, 096103 (2008)
We control the nucleation sites of quantum dots by small pit patterns on the substrate surface.
Appl. Phys. Lett. 93, 101908 (2008)
We have developed a simple “nanotomography” approach based on scanning probe microscopy and selective wet chemical etching.
Nano Lett. 8, 1404 (2008)
Integrated ohmic devices are fabricated from Si-based microtubes, and linear I-V curves are measured for rolled-up tubes suspended between two electrodes.
Appl. Phys. Lett. 93, 143113 (2008)
A. Malachias, Y. Mei, R. K. Annabattula, C. Deneke, P. R. Onck, O. G. Schmidt
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We use Si/SiO microtubes as optofluidic components to sense glucose concentrations in water.
Appl. Phys. Lett. 93, 094106 (2008)
A focused laser beam is used both as optical excitation and local heat source to obtain strong coupling in photonic molecules.
Phys. Rev. B 77, 035108 (2008)
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.
Lateral alignment of epitaxial quantum dots
Periodic metal patterns on a silicon surface provide unprecedented control over the morphology of highly ordered Ge islands.
Phys. Rev. Lett. 98, 106102 (2007)
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.
Adv. Mater. 19, 2124 (2007)
Strained rolled-up heterostructures allow for the creation of radial superlattices incorporating crystalline and non-crystalline material.
Appl. Phys. Lett. 90, 263107 (2007)
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.
Nano Lett. 7, 1676 (2007)
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.
Appl. Phys. Lett. 90, 073120 (2007)
Rolled-up Si/SiO tubes show optically resonant emission in the visible spectral range at room temperature.
Appl. Phys. Lett. 90, 091905 (2007)
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.
New J. Phys. 9, 315 (2007)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. Our work provides a convenient way to manipulate photon-plasmon coupling in three-dimensional micro-cavities, which is of interest for optical tuning abilities and control of enhanced light-matter interaction.
A sperm-driven micromotor acts as a targeted drug delivery system to potentially treat diseases in the female reproductive tract. More precisely, the sperm cell of the micromotor system is first loaded with an anticancer drug (DOX-HC). Then the system is guided by a synthetic magnetic harness to an in-vitro cultured tumor spheroid. Finally, the drug is delivered locally into the tumour once the sperm cell is freed by an integrated mechanical release mechanism.
H. Xu et al., ACS Nano 12, 327 (2018) URLPDF
This work was highlighted in:
Scientists are designing microscopic devices — microbots and micromotors — to eventually move through the body to perform medical tasks. So far, most microbot experiments have been done in vitro under conditions very different from those in the human body. In our extended comment we call on microrobotics researchers, materials scientists and bioimaging and medical specialists to work together to tackle the challenges on the way to in-vivo applications. And regulatory agencies need to put in place directives for testing therapeutics that are based on microbots.
M. Medina-Sánchez, O.G. Schmidt, Nature 545, 406 (2017)URLPDF
Although silicon has been widely used in modern electronic devices, its implementation in thermoelectric applications is still hindered due to its high intrinsic thermal conductivity, which leads to an extremely low energy conversion efficiency. Here, we report substantial reduction in planar thermal conductivities for both radial and planar Si/SiOx hybrid nanomembrane superlattices. By increasing the winding number of radial superlattices the in-plane thermal conductivity decreases continuously. Our results validate the thermal coupling effect among hybrid superlattice structures and shed light on a novel efficient way of managing phonon transport in Si-based devices.
Spermatozoa are promising components for microbots serving as biocompatible propulsion source, but also offering other interesting features such as their ability to fertilize, to respond to stimuli, or their ability to take up drugs which reveals fascinating new applications. Our recent article describes how spermatozoa can be useful parts of microdevices. It summarizes the recent progress on developing tubular and helical spermbots. The article provides also insight about the influencing factors on the performance of the spermbots and current challenges as well as future perspectives.
V. Magdanz et al., Adv. Mater. 29, 24 (2017) URL
This work was highlighted in:
Optical microtube resonators are monolithically integrated on photonic chips to demonstrate optofluidic functionality based on light-liquid interactions. The optofluidic structure is well-suited for potential biological/chemical sensing and analysis in a lab-in-a-tube system. Our experimental demonstration of monolithically integrated vertical ring resonators paves the way for optofluidics in three-dimensionally integrated photonic chips.
