US 12,235,464 B2
Device for near-field focusing and beam forming
Oksana Shramkova, Cesson-Sévigné (FR); Mitra Damghanian, Cesson-Sévigné (FR); Valter Drazic, Betton (FR); Laurent Blonde, Thorigné-Fouillard (FR); and Artem Boriskin, Thorigné-Fouillard (FR)
Assigned to InterDigital CE Patent Holdings, Paris (FR)
Appl. No. 17/282,348
Filed by InterDigital CE Patent Holdings, Paris (FR)
PCT Filed Oct. 1, 2019, PCT No. PCT/EP2019/076608
§ 371(c)(1), (2) Date Apr. 1, 2021,
PCT Pub. No. WO2020/070135, PCT Pub. Date Apr. 9, 2020.
Claims priority of application No. 18198001 (EP), filed on Oct. 1, 2018.
Prior Publication US 2021/0389597 A1, Dec. 16, 2021
Int. Cl. G02B 27/09 (2006.01)
CPC G02B 27/095 (2013.01) [G02B 27/0927 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical device for near-field focusing and beam forming, said device being configured to form, in a near field zone at a second surface of the device opposite to a first surface of the device, a field intensity distribution from an incident electromagnetic wave of visible light at the surface of said device, wherein said device is embedded in a first dielectric material having a first refractive index n1, said device comprising:
a main part, said main part made of a second dielectric material having a second refractive index n2,
wherein said second refractive index n2 is higher than said first refractive index n1; and
at least one insert, said at least one insert made of a third dielectric material having a third refractive index n3 that is higher than said second refractive index n2,
wherein said at least one insert is at least partially within said main part, said first refractive index n1 being different from said third refractive index n3,
wherein

OG Complex Work Unit Math
with W1 being a half width of said main part and λ1 being a first wavelength of the incident electromagnetic wave of visible light in said main part,
wherein

OG Complex Work Unit Math
with W2 being a half width of said at least one insert and λ2 being a second wavelength of the incident electromagnetic wave of visible light in said at least one insert,
wherein the incident electromagnetic wave of visible light at the first surface of the optical device is guided by opposite first edges of the main part of the optical device to form a first nanojet beam having a focal point in the near field zone at the second surface of the optical device, the first nanojet beam being formed from a crossing, at the focal point, of individual first nanojet beams from each of the opposite first edges of the main part, and
wherein the incident electromagnetic wave of visible light at the first surface of the optical device is guided by opposite second edges of the at least one insert to form a second nanojet beam at the focal point in the near field zone at the second surface of the optical device, the second nanojet beam being formed from a crossing, at the focal point, of individual second nanojet beams from each of the opposite second edges of the at least one insert, the first and the second nanojet beam thereby forming a single high-intensity nanojet beam at the focal point in the near field zone at the second surface of the optical device.