Device for forming an outgoing electromagnetic wave from an incident electromagnetic wave

Patent metadata

Field	Value
Publication number	US-12174512-B2
Application number	US-201917415491-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Dec 18, 2018
Publication date	Dec 24, 2024
Grant date	Dec 24, 2024

Abstract

An optical device forming an outgoing electromagnetic wave from an incident electromagnetic wave is disclosed. Such a device comprises at least one unit cell comprising:—at least two optical elements, an optical element being characterized by a type of optical response to said incident electromagnetic wave;—selection means enabling selective excitation of at least one optical element among the at least two optical elements, in response to said incident electromagnetic wave as a function of a wavelength of said incident electromagnetic wave, wherein said selection means comprise at one nanojet-based dielectric deflector compound of at least two dielectric material having different refractive indexes, and wherein said optical elements are placed at a distance from said nanojet-based dielectric deflector.

First claim

The invention claimed is:

1. An optical device for forming an outgoing electromagnetic wave from an incident electromagnetic wave, wherein the optical device comprises at least one unit cell, the unit cell comprising:
at least two optical elements; and
a nanojet-based dielectric deflector configured to enable selective excitation of at least one optical element among the at least two optical elements, in response to the incident electromagnetic wave, the excitation being a function of a wavelength of the incident electromagnetic wave,
wherein the nanojet-based dielectric deflector comprises at least one nanojet-based dielectric deflector compound of at least two dielectric materials comprising at least a first part of dielectric material having a first refractive index n 2 and a second part of dielectric material having a second refractive index n 3 ,
wherein the first part and the second part are embedded in a dielectric host medium having a third refractive index n 1 ,
wherein n 1 <n 3 <n 2 , and
wherein the optical elements are placed at a distance from the nanojet-based dielectric deflector.

2. The optical device of claim 1 ,
wherein the optical device is associated with a three-dimensional cartesian coordinate system defined by axis x, y and z with the z-axis being normal to the optical device, the first part and the second part of the nanojet-based dielectric deflector being positioned side by side along the x-axis, and
wherein nanojet-based dielectric deflectors of the optical device are separated along the x-axis by a layer of the dielectric host medium.

3. The optical device of claim 2 , wherein according to a cross section with a plane xz:
the first part having a first width W 1 along the x-axis,
the second part having a second width W 2 along the x-axis,
wherein the width W 1 and W 2 respectively equals to or is higher than half of the wavelength of the incident electromagnetic wave propagating respectively in the first part and in the second part,
the first part and the second part have a same height H along the z-axis, with

H
≈

W
1

+

W
2

tan
⁢

θ

B
⁢
1

+

tan
⁢

θ

B
⁢
3

,

θ B1 being the radiation angle of a first nanojet beam generated by a first edge along the z-axis of the nanojet-based dielectric deflector given by

θ

B
⁢
1

≈

90
⁢
°

-

sin

-
1

⁡

(

n
1

n
2

)

2

,

the first edge being between the first part and the host medium and θ B3 being the radiation angle of a second nanojet beam generated by a second edge along the z-axis of the nanojet-based dielectric deflector given by

θ

B
⁢
3

≈

90
⁢
°

-

sin

-
1

⁡

(

n
1

n
3

)

2

,

the second edge being between the second part and the host medium.

4. The optical device of claim 3 ,
wherein the distance is lower than or equals to H C -H B , and
wherein H C and H B are distances between a bottom of the nanojet-based dielectric deflector and intersection points of nanojet beams associated with edges of the first and second parts of the nanojet-based dielectric deflector with

H
B

≈

W
1

+

W
2

tan
⁢

θ

B
⁢
1

+

tan
⁢

θ

B
⁢
3

,

and
⁢

⁢

H

Assignees

• Interdigital Ce Patent Holdings

Inventors

• Shramkova Oksana
• Boriskin Artem
• Drazic Valter

Classifications

• B82Y20/00

  Nanooptics, e.g. quantum optics or photonic crystals · CPC title

• G02B2207/101

  Nanooptics · CPC title

• G02F1/29 Primary

  for the control of the position or the direction of light beams, i.e. deflection · CPC title

• G02B27/56 Primary

  Optics using evanescent waves, i.e. inhomogeneous waves · CPC title