Optical device
AssigneesCommissariat A L'energie Atomique Et Aux Energies Alternatives, STMicroelectronics (Grenoble 2) SAS, STMicroelectronics (Crolles 2) SAS
InventorsRaphael MULIN, Olivier JEANNIN, Francois DENEUVILLE
Life of this patent
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Abstract
The disclosure relates to an optoelectronic device comprising in a stack: one reflection polarizing filter, one phase-shifting element configured to add a π/4 phase shift in polarization, one active region, one reflector, so that the light radiation rays reflected by the reflector and passing through the phase-shifting element exhibit a new polarization phase-shifted by π/2 with respect to their initial polarization, the rays then being reflected anew by the polarizing filter in the direction of the active region.
Claims20
An optoelectronic device, comprising:
- a reflective polarizing filter, configured to solely transmit light radiation rays exhibiting a first polarization;
- a phase-shifting element configured to add a phase shift of π/4 in polarization to the light radiation rays passing through the phase-shifting element;
- an active region configured to absorb at least partially the light radiation rays, the phase-shifting element being between the polarizing filter and the active region in a stack along a first direction;
- and
- a reflector configured to at least partially reflect the light radiation rays, so that the light radiation rays reflected by the reflector and passing through the phase-shifting element exhibit a second polarization that is phase-shifted by π/2 with respect to the first polarization, the rays exhibiting the second polarization being reflected back by the polarizing filter towards the active region, the reflector being coupled to the active region opposite the phase-shifting element along the first direction.
A system comprising:
- a first device including:
- a first polarizing filter configured to transmit solely light radiation rays exhibiting a first polarization;
- an active region configured to absorb the light radiation rays;
- a phase-shifting element between the first polarizing filter and the active region along a first direction;
- and
- a reflector opposite the active region from the phase-shifting element along the first direction;
- a second device coupled to the first device along a second direction transverse to the first direction, the second device including a polarizing filter configured to solely transmit light radiation rays exhibiting a second polarization;
- and
- a polarization sorting element on the first and second devices configured to direct light radiation rays exhibiting the first polarization towards the first device and to direct light radiation rays exhibiting the second polarization towards the second device.
A device, comprising:
- an active region with a first side opposite a second side along a first direction;
- a reflector on the second side of the active region;
- a phase-shifting element on the first side of the active region;
- and
- a reflective polarizing filter on a first side of the phase-shifting element opposite the active region.
Dependencies are inferred from the claim text.