In this Letter, we propose a simple method to strongly enhance the sensitivity of the detection of the new technique called "SEnsing of Phage-Triggered Ion Cascade (SEPTIC)". The method accumulates those phage infected bacteria which are emitting ions and releases those which have stopped the ion emission activity. The estimated increasing of the sensitivity can reach several orders of magnitude at practical conditions.
A monolithic optical receiver chip consisting of a pin photodiode and a transimpedance preamplifier on a GaAs semi-insulating substrate is reported. The epitaxial layers for the photodiode are grown by hydride vapor phase epitaxy and the circuit elements are fabricated by selective ion implantation in the semi-insulating substrate. The integration scheme results in a planar surface which simplifies the processing of optoelectronic integrated chips.
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