Dielectric coated plasmonic photoemitter
AssigneesBoard of Trustees of Michigan State University, Oy Star AB
InventorsPeng Zhang, Lin Wu, Xiao Xiong, Yang Zhou
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Abstract
A dielectric coated plasmonic photoemitter is provided. An aspect of the present photonic apparatus includes a conductive photoemitter including a dielectric material coating or layered on a metallic core. The dielectric material being configured to enhance a local optical field strength and current density of the photoemitter as compared to a bare photoemitter without the dielectric layer. The dielectric layered photoemitter being tunable to transmit photoemissions from corners thereof with different photonic characteristics depending on a laser wavelength pulse received.
Claims20
A photonic apparatus comprising:
- a conductive photoemitter comprising a core with a proximal end connected to the substrate, and an opposite distal end that has a narrow width as compared to the proximal end, with a tapering side wall between the ends, a height dimension between the ends being at least twice that of the width of the distal end;
- the photoemitter further comprising a dielectric material coating the distal end and side walls of the core, the dielectric material having a thickness of 0.1-4.5 nm, and the dielectric material being configured to enhance a local optical field strength and current density of the photoemitter as compared to a core without the dielectric layer;
- a conductive substrate being laterally greater in size than the photoemitter, the proximal end of the photoemitter being connected to the substrate;
- a laser beam received by the photoemitter;
- the photoemitter being configured to transmit electron photoemissions therefrom in response to the laser beam;
- and
- the photoemitter having a truncated pyramidal shape configured to concentrate the electron photoemissions at multiple proximal end corners thereof.
A photonic apparatus comprising:
- a photoemitter including a metallic core having a corner;
- a dielectric layer on the core, being configured to enhance a local optical field of the photoemitter;
- and
- the photoemitter being configured to transmit photoemissions therefrom in response to laser beam contact with the photoemitter.
A photonic apparatus comprising:
- a photoemitter having a distal corner and a tapered shape;
- a dielectric layer on a core of the photoemitter, the dielectric layer being configured to enhance a local optical field of the photoemitter;
- and
- a first laser operably emitting a first wavelength pulse;
- at least a second laser emitting a second and different wavelength pulse;
- the dielectric layered photoemitter being tunable to transmit photoemissions from the corner thereof with different photonic characteristics depending on the wavelength pulse received;
- and
- the laser beam pulses each having a duration of less than 100 fs.
Dependencies are inferred from the claim text.