Sensitive temperature gradiometer for use at low temperatures.
A device capable of very sensitive temperature gradient measurements in the presence of relatively large ambient temperature fluctuations is described. The device uses a pair of ''matched'' superconducting thin films in a bridge arrangement, with a SQUID magnetometer probe as the null detector.
Righi-Leduc effect in the mixed state of a type-II superconductor
A transverse temperature gradient odd in magnetic field has been observed in the presence of longitudinal temperature gradient in a thin strip of Pb + 7.5 at. % In with its plane perpendicular to the field. At 2.5°K, the ratio of the transverse to the longitudinal temperature gradient is proportional to field above the upper critical field, and has a maximum in the mixed state below this field. The Righi-Leduc effect has the same sign in the mixed state as in the normal state.
Strategies for glass based photonic system integration
There is a clear tendency to integrate more and more opto-electronic and micro-optical components like optical fibers, laser diodes, modulators, isolators, beam-splitting components and micro lenses in also increasingly dense and complex assemblies. The paper will discuss thin glass as a very promising base material for that kind of photonic packaging on interposer and board level including optical interconnection using fibers.