TY - JOUR
T1 - On-Chip Optimal Stokes Nanopolarimetry Based on Spin–Orbit Interaction of Light
AU - Espinosa-Soria, Alba
AU - Rodriguez-Fortuno, Francisco J.
AU - Griol, Amadeu
AU - Martinez, Alejandro
PY - 2017/5/10
Y1 - 2017/5/10
N2 - Full measurement of the polarization of light at the nanoscale is expected to be crucial in many scientific and technological disciplines. Ideally, such measurements will require miniaturized Stokes polarimeters able to determine polarization nondestructively, locally, and in real time. For maximum robustness in measurement, the polarimeters should also operate optimally. Recent approaches making use of plasmonic nanostructures or metasurfaces are not able to fulfill all these requirements simultaneously. Here, we propose and demonstrate a method for subwavelength-footprint Stokes nanopolarimetry based on spin–orbit interaction of light. The method, which basically consists on a subwavelength scatterer coupled to a (set of) multimode waveguide(s), can fully determine the state of polarization satisfying all the previous features. Remarkably, the nanopolarimetry technique can operate optimally (we design a nanopolarimeter whose polarization basis spans 99.7% of the maximum tetrahedron volume inside the Poincaré sphere) over a broad bandwidth. Although here experimentally demonstrated on a silicon chip at telecom wavelengths, spin–orbit interaction-based nanopolarimetry is a universal concept to be applied in any wavelength regime or technological platform.
AB - Full measurement of the polarization of light at the nanoscale is expected to be crucial in many scientific and technological disciplines. Ideally, such measurements will require miniaturized Stokes polarimeters able to determine polarization nondestructively, locally, and in real time. For maximum robustness in measurement, the polarimeters should also operate optimally. Recent approaches making use of plasmonic nanostructures or metasurfaces are not able to fulfill all these requirements simultaneously. Here, we propose and demonstrate a method for subwavelength-footprint Stokes nanopolarimetry based on spin–orbit interaction of light. The method, which basically consists on a subwavelength scatterer coupled to a (set of) multimode waveguide(s), can fully determine the state of polarization satisfying all the previous features. Remarkably, the nanopolarimetry technique can operate optimally (we design a nanopolarimeter whose polarization basis spans 99.7% of the maximum tetrahedron volume inside the Poincaré sphere) over a broad bandwidth. Although here experimentally demonstrated on a silicon chip at telecom wavelengths, spin–orbit interaction-based nanopolarimetry is a universal concept to be applied in any wavelength regime or technological platform.
U2 - 10.1021/acs.nanolett.7b00564
DO - 10.1021/acs.nanolett.7b00564
M3 - Article
SN - 1530-6984
VL - 17
SP - 3139
EP - 3144
JO - Nano Letters
JF - Nano Letters
IS - 5
ER -