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Durham University

Department of Engineering

Staff Profile

Publication details for Mr Andreas Klein

Klein, Andreas K. , Hammler, Jonathan, Balocco,Claudio & Gallant, Andrew J. (2018). Machinable ceramic for high performance and compact THz optical components. Optical Materials Express 8(7): 1968-1975.

Author(s) from Durham


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 low losses at THz frequencies: n = 2.65, α = 0.4 cm−1. To demonstrate the shaping capabilities, a Fresnel lens is fabricated with a micro-milling system. Additionally, a prism as an example of a bulk component is demonstrated. Both a THz time domain spectrometer and a vector network analyzer (0.75–1.1 THz) are used for the optical characterization and the absorption coefficient is precisely obtained in the VNA frequency range.