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Scattering of spoof surface plasmon polaritons in defect-rich THz waveguides (2019)
Journal Article
Klein, A. K., Basden, A., Hammler, J., Tyas, L., Cooke, M., Balocco, C., …Gallant, A. (2019). Scattering of spoof surface plasmon polaritons in defect-rich THz waveguides. Scientific Reports, 9(1), Article 6288. https://doi.org/10.1038/s41598-019-42412-6

We report on the first observation of ‘Spoof’ Surface Plasmon Polariton (SPP) scattering from surface defects on metal-coated 3D printed, corrugated THz waveguiding surfaces. Surface defects, a result of the printing process, are shown to assist the... Read More about Scattering of spoof surface plasmon polaritons in defect-rich THz waveguides.

Machinable ceramic for high performance and compact THz optical components (2018)
Journal Article
Klein, A. K., Hammler, J., Balocco, C., & Gallant, A. J. (2018). Machinable ceramic for high performance and compact THz optical components. Optical Materials Express, 8(7), 1968-1975. https://doi.org/10.1364/ome.8.001968

The properties of Shapal Hi-M Soft, an aluminum nitride based ceramic, as a material for THz optical components are investigated and compared with other ceramic materials. Shapal is a low-cost and machinable ceramic with a high-refractive index and l... Read More about Machinable ceramic for high performance and compact THz optical components.

Field imaging near to the surface of terahertz reflective optics using a vector network analyzer (2017)
Journal Article
Hajji, M., Hammler, J., Zeze, D., Balocco, C., & Gallant, A. J. (2017). Field imaging near to the surface of terahertz reflective optics using a vector network analyzer. Applied Optics, 56(31), 8746-8750. https://doi.org/10.1364/ao.56.008746

A vector network analyzer-based quasi-optical measurement system that is suitable for mapping electric field intensity and phase near to the surface of terahertz reflective optics is presented. The system uses a fixed five parabolic mirror and transm... Read More about Field imaging near to the surface of terahertz reflective optics using a vector network analyzer.

Low-loss, Low-cost, High Refractive Index Machinable Ceramic For THz Optical Components (2017)
Presentation / Conference Contribution
Klein, A., Hammler, J., Zeze, D., Balocco, C., & Gallant, A. J. (2017). Low-loss, Low-cost, High Refractive Index Machinable Ceramic For THz Optical Components. In 2017 42nd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). https://doi.org/10.1109/IRMMW-THz.2017.8066898

The properties of a machinable, high refractive index, low-loss, low-cost material are investigated. Both a THz-TDS and a Vector Network Analyzer (0.75-1.1 THz) are used to characterize the material and precisely obtain the absorption coefficient. Fr... Read More about Low-loss, Low-cost, High Refractive Index Machinable Ceramic For THz Optical Components.

Free-Space Permittivity Measurement at Terahertz Frequencies with a Vector Network Analyser (2016)
Journal Article
Hammler, J., Gallant, A. J., & Balocco, C. (2016). Free-Space Permittivity Measurement at Terahertz Frequencies with a Vector Network Analyser. IEEE Transactions on Terahertz Science & Technology, 6(6), 817-823. https://doi.org/10.1109/tthz.2016.2609204

A simple system, based on a vector network analyzer, has been used with new numerical de-embedding and parameter inversion techniques to determine the relative permittivity (dielectric properties) of materials within the frequency range 750–1100 GHz.... Read More about Free-Space Permittivity Measurement at Terahertz Frequencies with a Vector Network Analyser.

Polymer-Based Micro-Golay Cells For THz Detection (2016)
Presentation / Conference Contribution
Stefanova, P., Hammler, J., Klein, A., Gallant, A., & Balocco, C. (in press). Polymer-Based Micro-Golay Cells For THz Detection.

We report on the design, simulation and fabrication of polymer-composite micro-Golay cells for THz and far-infrared detection. Preliminary experimental results showed that the cell’s mechanical, thermal and optical properties make it an excellent can... Read More about Polymer-Based Micro-Golay Cells For THz Detection.

Free-space material characterisation at terahertz frequencies using a vector network analyser (2015)
Presentation / Conference Contribution
Hammler, J., Gallant, A., & Balocco, C. (2015). Free-space material characterisation at terahertz frequencies using a vector network analyser. . https://doi.org/10.1109/ursi-at-rasc.2015.7302827

While dielectric properties of many materials have been extensively characterised at low frequencies and into the microwave region of the electromagnetic spectrum, published information is much sparser in the THz region. Knowledge of permittivity is... Read More about Free-space material characterisation at terahertz frequencies using a vector network analyser.

3D polymer structures with variable permittivity at terahertz frequencies (2015)
Presentation / Conference Contribution
Hammler, J., Pan, Y., Gallant, A., & Balocco, C. (2015). 3D polymer structures with variable permittivity at terahertz frequencies. In 40th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 23-28 August 2015, Hong Kong (1-2). https://doi.org/10.1109/irmmw-thz.2015.7327458

Titanium dioxide (TiO2) powder has been blended with polydimethylsiloxane (PDMS) to manufacture a composite polymer with variable permittivity. Vector network analyser measurements taken between 0.75-1.1 THz quantify the relationship between TiO2 con... Read More about 3D polymer structures with variable permittivity at terahertz frequencies.

Simple de-embedding and simulation technique to find permittivity with a THz vector network analyser (2015)
Presentation / Conference Contribution
Hammler, J., Gallant, A., & Balocco, C. (2015). Simple de-embedding and simulation technique to find permittivity with a THz vector network analyser. In 40th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 23-28 August 2015, Hong Kong (1-2). https://doi.org/10.1109/irmmw-thz.2015.7327822

A simple and fast method for measuring the dielectric constant with a THz vector network analyser (VNA) has been developed. A numeric de-embedding technique removes free-space propagation effects, then simulation of Maxwell's equations simultaneously... Read More about Simple de-embedding and simulation technique to find permittivity with a THz vector network analyser.