Detection of Explosive RDX using Parallel Plate Waveguide THz-TDS

Study of the impedance mismatch at the output end of a THz parallel-plate waveguide

We study the reflection of terahertz (THz) radiation at the end of a parallel-plate waveguide (PPWG), due to the impedance mismatch between the propagating transverse-electromagnetic mode and the free-space background. We find that, for a PPWG with uniformly spaced plates, the reflection coefficient at the output face increases as the plate separation decreases, consistent with predictions by e...

Sub-Nanogram Detection of RDX Explosive by Monoclonal Antibodies

Polyclonal and monoclonal antibodies were raised to protein carrier molecules haptenized with RDX, a major component of many plastic explosives including Semtex. Sera from immunized mice detected RDX protein conjugates in standard ELISA. Clonally purified monoclonal antibodies had detection limits in the sub-ng/mL range for underivatized RDX in competition ELISA. The monoclonal antibodies are n...

Liquids and molecular solids investigated by THz time-domain reflection and parallel-plate waveguide spectroscopy

A statistical approach to RDX detection with THz reflection spectra

Substrate independence of THz vibrational modes of polycrystalline thin films of molecular solids in waveguide THz-TDS

thin films of molecular solids in waveguide THz-TDS S. Sree Harsha, Joseph. S. Melinger, S. B. Qadri, and D. Grischkowsky School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA Electronics Science and Technology Division, Code 6812, Naval Research Laboratory, Washington, D.C. 20375, USA Materials Science and Technology Division, Code 6366, Nava...