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 ~80 μm, 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 μm obstruction.
A very simple scheme for spectrally resolved imaging by means of curved polymeric gratings / C. Minnai, L. Cremonesi, P. Milani, M. Potenza. - In: MATERIALS RESEARCH EXPRESS. - ISSN 2053-1591. - 6:6(2019), pp. 065044.1-065044.7. [10.1088/2053-1591/ab08a4]
A very simple scheme for spectrally resolved imaging by means of curved polymeric gratings
C. MinnaiPrimo
;L. CremonesiSecondo
;P. MilaniPenultimo
;M. PotenzaUltimo
2019
Abstract
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 ~80 μm, 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 μm obstruction.File | Dimensione | Formato | |
---|---|---|---|
Minnai_2019_Mater._Res._Express_6_065044.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
1 MB
Formato
Adobe PDF
|
1 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.