13 Jan 2021
Tiny robots and sensors need tiny batteries – here is how to do it.
23 Sep 2020
Please have a look at our recent review on the different imaging techniques of microrobots for their potential use in medical applications.
23 Sep 2020
We have created an on-chip microplatform to investigate the electrochemistry of a single rolled-up microtubular anode.
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.
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.
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.
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.
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.
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 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.
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.
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.
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 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 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.
In this work, we address curvature-driven modifications of magnetic properties in confined cylindrically curved magnetic nanomembranes.
We design nanoscale tools in the form of autonomous and remotely guided catalytically self-propelled rolled-up tubes.
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.
A lab-in-a-tube device comprises numerous ultracompact components in a single tube which can be developed using rolled-up technology.
We design and investigate three-dimensional microhelix coil structures that are radial-, corkscrew-, and hollow-bar-magnetized.
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.
Optofluidic microcavities from rolled-up ring resonators with subwavelength wall thicknesses are fabricated with excellent sensing function.
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
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 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.
We have presented an overview on approaches currently employed to fabricate advanced quantum dot configurations by epitaxial growth.
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.
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
we demonstrate triggered single-photon emission from a single quantum dot grown on Si substrate for the first time.
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.
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.