Luminis Pty Limited

Derek Abbott

Peter Celinski

Kamran Eshraghian

Samuel Mickan

Said Al-Sarawi

A diagnostic apparatus including a terahertz generator taking the form of a femtosecond laser exciting either an optoelectric crystal of a photoconductive dipole antenna the terahertz radiation is directed onto a target preferably held close by or abutting an enclosure including a reflection receiving window and housing terahertz detector for detecting terahertz radiation. Preferably the terahertz radiation generator forms part of the receiving window. The enclosure has a modified atmosphere to permit ready transmission of terahertz radiation. A beam splitter is positioned between the laser and the terahertz generator to split off a probe laser beam from the terahertz inducing laser radiation which is also directed to the detector means. The output from the detector being determined by the amplitude of that part of the reflected teraherz radiation wave coaligned with the probe laser at the detector. A delay is positioned in the probe laser path to altering the length of the probe laser path over terahertz subwavelength distances so that different parts of the terahertz wave form can be interrogated by the probe laser to thereby ascertain the shape and dimensions of the reflected terahertz radiation.

Diagnostic apparatus using terahertz radiation

A binary digital logic level sensitive latch comprising a first inverter that provides an output (O ). At least one input signal (I ) and an activation signal (Clk) are provided to the first inventer both being capacitively coupled to an input of the first inverter and a switching threshold of the first inverter. The capacitance of the couplings being predetermined such that the output of the first inverter (O ) is a NOR function of the inputs signals and the activation signal O &equals;{overscore (I &plus;Clk)}. A second inverter has as inputs capacitively coupled the output of the first inverter (O ), the activation signal (Clk) and an inverted pervious output signal (P) to provide output (O ). A switching threshold of the second inverter and the capacitance of the couplings being predetermined such that the output of the second inverter (O ) takes the function of: O &equals;{overscore ((Clk&times;P)&plus;O )}.

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Adelaide, Australia

Derek Abbott