Compact Tuneable Light Module
A compact tuneable light module, based on a piezo-actuated Fabry-Pérot interferometer module, will be studied to be combined with the micro-spectrometer to obtain an integrated optical spectrometer system.
Miniaturized Optical Spectrometer
The micro-spectrometer at system level will be addressed, including:
- the optical modelling, design and fabrication of the optical components (refractive, reflective and segmented-grating optics), the mechanical aspects as well as the proof-of-principle of the optical system.
- the CMOS sensors including programming, interfacing and data processing, as well as the integration towards a functional prototype. Application tests of the integrated module for different application domains in consultation with the Advisory Board.
Development of a next-generation spectrometer design based on computational imaging:
- using optical modelling simulations, reflective gratings will be designed with the goal to spread the light information over the whole detector area instead of linear segments. The complementarity and incoherence of reflected patterns will be enforced using pseudo or quasi-random samples generators.
- from the simulated optical gratings, a calibrated dictionary of basic functions will be populated for several key wavelengths by using the tuneable FPI light source. Then an inverse spectrum reconstruction problem will be solved from the acquired measurements. Existing iterative regularized optimisation methods will be used to approximate the solution.