Terahertz (THz) waves form a part of the optical spectrum which is rapidly becoming interesting because of applications like medical imaging, gas-liquid sensing and non-destructive material characterization . They are interesting for bio-medical imaging and cancer study, and are favored candidates over X-rays because of their non-ionizing impact on organic tissues. Like RF waves they can penetrate materials for characterization, while also giving higher resolution, making them useful for security applications. Integrated solutions for optical imaging in the visible and infra-red region of the spectrum have been demonstrated. However such solutions for THz remain elusive, primarily because of lack of availability of strong THz sources in addition to lack of efficient light-collection integrated optics in the THz range. This is because optical properties of materials like silicon are very different at THz frequencies.
In this project the candidate will design an integrated Fresnel lens  which will help enhance the THz throughput, both from single THz antennas and antenna-arrays on a silicon chip. The candidate will use concepts of diffractive optics and simulation tools to envision a realistic experimental scenario and obtain design parameters for lenses for different THz frequencies and demonstrate enhanced THz output.
 Albert Redo-Sanchez, Norman Laman, Brian Schulkin, Thomas Tongue, "Review of Terahertz Technology Readiness Assessment and Applications", Journal of Infrared, Millimeter, and Terahertz Waves, 34, 500 (2013)
 A. Davis & F. Kühnlenz, "Optical Design using Fresnel Lenses", Optik & Photonik, 2: 52 (2007)
Type of project: Thesis
Duration: 3-6 months
Required degree: Master of Science
Required background: Physics
Supervising scientist(s): For further information or for application, please contact: Sachin Kasture (Sachin.Kasture@imec.be)
Imec allowance will be provided.