The realisation of hyperspectral terahertz imaging is a significant step towards understanding of the life sciences on all scales. A key to this understanding is the retrieval of dielectric properties from such images, a task which is plagued by experimental limitations, challenging the terahertz community for more than two decades. In this contribution, we propose a new combined retrieval methodology to overcome misalignments and Fabry-Pérot effects on the extraction of the dielectric properties of human bone samples through the combination of the Kramers-Kronig relations and Fabry-Pérot reflection modelling. Results extracted from ∼100 µm human bone slices composed largely of collagen are consistent with those measured for pristine collagen samples. This represents another stepping-stone towards the adoption of terahertz imaging into pre- and clinical practice.
Laser Induced Periodic Surface Structures (LIPSS) and Direct Laser Writing (DLW) enable the selective fabrication of micro/nano surface structures on a broad range of materials. Such engineered surfaces can be tailored and have demonstrated various functional responses, from optical to hydrophilic/phobic and non-fouling properties. One still limiting factor to the mass production of such functional surfaces is the durability of their surface features. Indeed, surface damages can be detrimental to the attractive functional properties. In this talk, several textured surfaces (Lotus-leaf inspired hierarchical features and triangular LIPSS) were laser-fabricated on stainless steel parts using both short and ultrashort laser pulses ; and replicated on polypropylene replicas parts via injection moulding. The surface response of textured steel parts were investigated after large-area wear cycles and abrasive injection moulding. Surface hardening was used as a way to extend the lifetime of the textured surfaces. Finally, textured polypropylene replicas and their superhydrophobic responses are investigated following standardized mechanical cleaning cycles. In all cases, the degradation of surface textures had a clear impact on surface topography and thus on their functional properties.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.