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US 9,960,004 B2Granted
Semi-transparent photocathode with improved absorption rate
AssigneePhotonis France
InventorsGert Nützel, Pascal Lavoute
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Abstract
The invention relates to a semi-transparent photocathode (1) for a photon detector having an increased absorption rate for a preserved transport rate. According to the invention, the photocathode (1) includes a transmission diffraction grating (30) able to diffract said photons and provided in the support layer (10) on which the photoemissive layer (20) is deposited.
Claims11
A semi-transparent photocathode (1) for a photon detector, including:
- a transparent support layer (10) having a front face (11) to receive said photons and an opposite back face (12), and
- a photoemissive layer (20) deposited directly on said back face (12) and having an opposite emitting face (22), intended to receive said photons from said support layer (10) and to responsively emit photoelectrons from said emitting face (22),
- characterized in that it includes a transmission diffraction grating (30) able to diffract said photons, provided in the support layer (10) and located at said back face (12);
- said diffraction grating (30) being formed of a periodical arrangement of patterns (31) filled with a pattern material having an optical index different from the material of the support layer (10);
- said diffraction grating (30) being further provided so as to bound at least partly the back face (12) of the support layer (10) by being flush with the same.
2 more elements
Dependencies are inferred from the claim text.