In this progress report the development of three‐dimensional μ‐printing and its impact as an enabling technology onto different scientific fields is reviewed. Driven by direct laser writing via two‐photon absorption, has reached a level maturity ease application such that 3D printing on micrometer scale can now be considered. While underlying still developing towards higher resolution increasing speed fabrication, last five years have seen new rising were obviously enabled μ‐printing. Among...

One of the major challenges in high-resolution μ-printing is cross-talk between features written close proximity-the proximity effect. This effect prevents, e.g., gratings with periods below a few hundred nanometers. Surprisingly, dependence this on space and time has not thoroughly been investigated. Here, we present spatial-light-modulator based method to dynamically measure strength length timescales typical μ-printing. The compared various photo resists. results indicate that molecular...

We control the point-spread-function of high numerical aperture objectives used for direct laser writing with a spatial light modulator. Combining aberration correction different types amplitude filters to reduce aspect ratio enhances structural and optical quality woodpile photonic crystals. Here, is crucial ensure functionality filters. Measured point-spread-functions compare well calculations structures generated by writing. The shaped not only influences maximum achievable...

The generation of multi foci is an established method for high-speed parallel direct laser writing, scanning microscopy and optical tweezer arrays. However, the quality reduces with increasing resolution due to interference effects. Here, we report on a spatial-light-modulator-based that allows highly uniform, close Gaussian spots diffraction limited using wavelength 780 nm. We introduce modifications standard algorithm calculates field distribution entrance pupil high numerical aperture...

Abstract We review the fundamental concepts of direct laser writing (DLW) 3D metallic structures via photoreduction and give an overview over state-of-the-art. On one hand, microstructures nanostructures play important role in photonic applications such as resonators, antennas, metamaterials, polarizers. other DLW offers a flexible fast way to fabricate microstructures. Because underlying mechanisms from first photoreaction final microstructure are quite complex not yet well controlled, we...

Independent control of the spatial intensity, phase and polarization distribution has numerous applications in direct laser writing, microscopy optical trapping. Especially, it is well known that inversion Debye-Wolf diffraction integral usually leads to spatially varying maps. Here, we present a prism grating free setup built around single phase-only spatial-light-modulator for full distributions. These distributions are not limited non-diffractive beams do require any change setup. We...

Controlling the point-spread-function in three-dimensional laser lithography is crucial for fabricating structures with highest definition and resolution. In contrast to microscopy, aberrations have be physically corrected prior writing, create well defined doughnut modes, bottlebeams or multi foci modes. We report on a modified Gerchberg-Saxton algorithm spatial-light-modulator based automated aberration compensation optimize arbitrary laser-modes high numerical aperture system. Using...

Sensing with undetected photons allows access to spectral regions simultaneous detection of another region and is based on nonlinear interferometry. To obtain the full information a sample, corresponding interferogram has be analyzed in terms amplitude phase, which been realized so far by multiple measurements followed phase variation. Here, we present polarization-optics-based phase-quadrature implementation interferometer for imaging infrared region. This us visibility single image...

A method for direct fabrication of 3D silver microstructures with high throughput on virtually any substrate is presented. The based laser-induced photoreduction ions to atoms, supported by nucleation, functionalization and a multiple exposure process. combination the novel photosensitive suspension scheme enables effective speeds up 1 cm per second, minimum structure size less than μm, resolution more 750 lines/mm resistivity 3.0 · 10

Artificial gauge fields enable extending the control over dynamics of uncharged particles, by engineering potential landscape such that particles behave as if effective external are acting on them. Recent years have witnessed a growing interest in artificial generated either geometry or time-dependent modulation, they been enablers for topological phenomena and synthetic dimensions many physical settings, e.g., photonics, cold atoms acoustic waves. Here, we formulate experimentally...

The functionalization of dental implants, aiming at the improvement long-term acceptance, is pivotal interest in research. Bone, connective tissue, and oral epithelium are direct contact to implant surface exhibit distinct requirements for proper growth differentiation. authors applied laser writing atomic layer deposition generation TiO2-coated micro nanostructures which were subsequently tested colonization behavior SaOs-2 cells, an osteosarcoma cell line revealing osteoblastic properties....

The 3D range-migration algorithm (RMA) and its 2D equivalent, the omega-k algorithm, are employed in a wide range of applications where reconstruction synthetic aperture data is required, from satellite radar imaging planets over seismic earth crust, down to phased-array ultrasound ultrasonic application, recently in-line for non-destructive testing. These algorithms based on Fourier transforms share their time-complexity. This limits highly-resolved measurement be processed at high speeds...

We present a robust, fiber-based endoscope with silver direct-laser-written structure for radio frequency (RF) emission next to the optical fiber facet. Thereby, we are able excite and probe sample, such as nitrogen-vacancy (NV) centers in diamond, RF signals simultaneously specifically measure fluorescence of sample fully through fiber. At our targeted range around 2.9 GHz, facet core is near-field RF-guiding structure, which comes advantage an optimal intensity decreasing rapidly distance....

Three-dimensional metallic microstructures find applications as stents in medicine, ultrabroadband antennas communications, micromechanical parts or structures of more fundamental interest photonics like metamaterials. Direct metal printing such using three-dimensional laser lithography is a promising approach, which not extensively applied yet, fabrication speed, surface quality, and stability the resulting are limited so far. In order to identify limiting factors, we investigate influence...

We present a real-time measurement technique, based on time-stretching for measuring the temporal dynamic of ultrafast absorption variations with sampling-rate up to 1.1 TS/s. The single-shot captured data are stretched in resonator-based time-stretch system variable stretch-factor 13.8. time-window capturing signal interest is about 800 ps an update-rate 10 MHz. An adapted optical backpropagation algorithm introduced reconstructing original unstretched event. As proof-of-principle...

We demonstrate first results of 3D direct laser writing (DLW) metallic filter structures on narrow-band antenna-coupled field-effect transistors (TeraFET) directly the detector chip. The chip itself contains a spectroscopic line array resonant TeraFETs ranging from 0.53 to 1.98 THz. apply metal process die, printing made silver particles for narrowing frequency response and suppression spurious waves. In our measurements, we investigate changes in detection resonance comparison bare TeraFET...

We combine direct laser writing with electron-beam lithography to fabricate arrays of 3D tapered gold double-helices feature sizes well below 100 nm, enabling chiral metamaterials and helical nanoantennas at telecom frequencies.