Publication

A very simple scheme for spectrally resolved imaging by means of curved polymeric gratings

Minnai, Chloe; Cremonesi, Llorenc; Milani, Paolo; Potenza, Marco A. C.: Mater. Res. Express 6 (2019) 065044 [DOI: 10.1088/2053-1591/ab08a4]

We report the fabrication of a simple and inexpensive device based on diffractive optics for spectrally resolved imaging. A brass surface manufactured on a metal lathe and a deformable, reflecting diffraction grating guarantee spatially and spectrally resolved images without the need for other optical elements. The grating is a metal-polymer nanocomposite replica of a plastic grating: reflectivity of the transparent dielectric substrate is obtained by the implantation of gold clusters, hence preserving deformability. The brass surface is a portion of a rotation ellipsoid, on which the deformable grating adheres to gain optical power. According to the optical tests performed on the system, the achieved spatial resolution of the system is similar to 80 mu m, whereas limiting spectral resolution of about 3 nm is observed. Reflectivity of the zero-order reflection and the first order diffraction approaches 45\% and 5\% respectively. We detail the results for the reconstruction of an on-axis and off-axis pointlike source, and a vertically extended slit-like source with a 110 mu m obstruction.

Affiliation: Minnai, C (Reprint Author), Univ Milan, Dept Phys, Via Celoria 16, I-20133 Milan, Italy. Minnai, C (Reprint Author), INFN Milan, Via Celoria 16, I-20133 Milan, Italy. Minnai, C (Reprint Author), Univ Milan, CIMAINA, Via Celoria 16, I-20133 Milan, Italy. Minnai, Chloe; Cremonesi, Llorenc; Milani, Paolo; Potenza, Marco A. C., Univ Milan, Dept Phys, Via Celoria 16, I-20133 Milan, Italy. Minnai, Chloe; Cremonesi, Llorenc; Milani, Paolo; Potenza, Marco A. C., INFN Milan, Via Celoria 16, I-20133 Milan, Italy. Minnai, Chloe; Cremonesi, Llorenc; Milani, Paolo; Potenza, Marco A. C., Univ Milan, CIMAINA, Via Celoria 16, I-20133 Milan, Italy.