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Wavelength-dependent photoproduct formation of phycocyanobilin in solution – indications for competing reaction pathways
Phycocyanobilin (PCB), an open-chain tetrapyrrole, makes up - slightly modified - the chromophore in phytochromes, the importance of which triggered model studies on the photochemistry of free PCB. We...
PublicationsSurface enhanced Raman spectroscopy (SERS) – progress and trends
Surface enhanced Raman spectroscopy (SERS) combines molecular fingerprint specificity with potential single-molecule sensitivity. Therefore, the SERS technique is an attractive tool for sensing of molecules...
PublicationsViren mit Leitfähigkeit detektieren
Die Jenaer Biochip-Initiative hat ein chipbasiertes Verfahren entwickelt, das anders als etablierte Biochips den Gleichstromwiderstand als Messgröße nutzt. Damit lassen sich Krankheitserreger wie das...
PublicationsSingle and multilayer metamaterials fabricated by nanoimprint lithography
We demonstrate for the first time a fast and easy nanoimprint lithography (NIL) based stacking process of negative index structures like fishnet and Swiss-cross metamaterials. The process takes a few seconds,...
PublicationsDemonstration of digital readout circuit for superconducting nanowire single photon detector
We demonstrate the transfer of single photon triggered electrical pulses from a superconducting nanowire single photon detector (SNSPD) to a single flux quantum (SFQ) pulse. We describe design and test...
PublicationsSQIF-based dc SQUID amplifier with intrinsic negative feedback
We report on a two-stage system consisting of a dc SQUID magnetometer inductively coupled to an amplifying second stage realized by a SQIF. The SQIF is a series or parallel connection of dc SQUIDs with...
PublicationsMagnetic core-shell fluorescent pH ratiometric nanosensor using a stöber coating method
We describe the use of a modified Stöber method for coating maghemite ( -Fe2O3) nanocrystals with silica shells in order to built magnetic fluorescent sensor nanoparticles in the 50–70 nm diameter range....
PublicationsCryogenic ultra-low noise SiGe transitor amplifier
An ultra-low-noise one-stage SiGe heterojunction bipolar transistor amplifier was designed for cryogenic temperatures and a frequency range of 10 kHz-100 MHz. A noise temperature T N ≈ 1.4...
PublicationsBi-SQUIDs with submicron cross-type Josephson tunnel junctions
We report on the development and experimental evaluation of bi-SQUIDs with sub-micron cross-type shunted Josephson tunnel junctions characterized by low capacitance. Such a technology meant for SQUID sensors,...
PublicationsMolecular Gating of Silicon Nanowire Field-Effect Transistors with Nonpolar Analytes
Silicon Nanowire Field Effect Transistors (Si NW FETs) have been used as powerful sensors for chemical and biological species. The detection of polar species has been attributed to variations in the electric...
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