Bidimensional near-field sampling spectrometry.
We report on a concept of compact optical Fourier-transform spectrometer based on bidimensional (2D) spatial sampling of a confined interferogram. The spectrometer consists of a nanostructured glass surface on which two light beams interfere in total internal reflection. Subwavelength spatial sampling of the interferogram near field is achieved by introducing a tilt angle between a 2D array of optical nanoantennas and the interferogram pattern. The intensity distribution of the scattered light is recorded on a 2D CCD camera, and a one-dimensional Fourier transform of the interferogram is used to recover the input light spectrum. Experimental results show a wide spectral bandwidth in the visible range, down to 380 nm, with spectral resolution of 1.6 nm around 780 nm.
Renault
Mikael
M
Laboratoire de Nanotechnologie et d’instrumentation optique, Institut Charles Delaunay, Université de Technologie de Troyes, BP2060, Troyes, 10010, France.
Hadjar
Yassine
Y
Blaize
Sylvain
S
Bruyant
Aurélien
A
Arnaud
Laurent
L
Lerondel
Gilles
G
Royer
Pascal
P