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Inhomogeneous microlens device for near-field focusing, beam forming, and high-efficiency far-field device implementation
US12044860B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12044860-B2 |
| Application number | US-201917282349-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 1, 2019 |
| Priority date | Oct 1, 2018 |
| Publication date | Jul 23, 2024 |
| Grant date | Jul 23, 2024 |
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Abstract
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The disclosure relates to an optically-transparent device (100) comprising a main part (10) of dielectric material having a refractive index n2. Such an optically-transparent device is configured for forming a field intensity distribution in a near zone of said device, from electromagnetic waves incidentally illuminating said device, when said device is embedded in a dielectric material having a refractive index n1 lower than said refractive index n2. Said device (100) further comprises at least one insert (11) of dielectric material having a refractive index n3 lower than said refractive index n2 and different from said refractive index n1, said at least one insert being inserted into said main part, and each one of said at least one insert and said main part having respectively an edge of a step formed by a base surface of said at least one insert or said main part and a lateral surface of said at least one insert or said main part, said base surface being defined with respect to an arrival direction of said electromagnetic wave. The disclosure also relates to a system comprising a plurality of above-described optically-transparent devices uniformly distributed within a dielectric host medium, so as to form a far-field device for far-field applications.
First claim
Opening claim text (preview).
The invention claimed is: 1. An optically-transparent device, the device being configured to form a field intensity distribution in a near zone of the device from an electromagnetic wave incident on the device, wherein the device is embedded in a first dielectric material having a first refractive index n 1 , the device comprising: a main part, the main part made of a second dielectric material having a second refractive index n 2 , wherein the second refractive index n 2 is higher than the first refractive index n 1 ; and at least one insert, the at least one insert made of a third dielectric material having a third refractive index n 3 that is lower than the second refractive index n 2 , the third refractive index n 3 being different from the first refractive index n 1 , and the at least one insert being within the main part, wherein a width of the main part and a width of the at least one insert are configured so that W 1 -W 2 ≥λ/2 and 2W 1 ≤10λ, with W 1 corresponding to a half-width of the main part, W 2 corresponding to a half-width of the at least one insert, and λ corresponding to a wavelength of the electromagnetic wave in the main part, and wherein each of the at least one insert or the main part and a lateral surface of the at least one insert or the main part, the base surface being defined with respect to an arrival direction of the electromagnetic wave, wherein the optically-transparent device is configured to form at least a first nanojet beam and a second nanojet beam, and wherein a first focal position of the first nanojet beam is different from a second focal position of the second nanojet beam. 2. The optically-transparent device of claim 1 , wherein, when the electromagnetic wave is incident from a bottom surface of the optically-transparent device, the optically-transparent device is configured to form two nanojet beams located respectively at focal positions (R fL , H fL ) and (R fR , H fR ) given by approximate formulas: R fL ≈ tan Θ B 2 W 1 + tan Θ B 1 tan Θ B 2 ( H 2 - H 1 ) + tan Θ B 1 W s tan Θ B 1 + tan Θ B 2 , H fL ≈ W 1 - R fL tan Θ B 1 R fR ≈ tan Θ B 2 W 1 + tan Θ B 1 tan Θ B 2 ( H 2 - H 1 ) + tan Θ B 1 ( 2
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Classifications
Nanooptics · CPC title
Lenses (lenses per se G02B3/00) · CPC title
structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings (G02B5/189 takes precedence) · CPC title
Inhomogeneous or irregular arrays, e.g. varying shape, size, height · CPC title
- G02B27/56Primary
Optics using evanescent waves, i.e. inhomogeneous waves · CPC title
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- What does patent US12044860B2 cover?
- The disclosure relates to an optically-transparent device (100) comprising a main part (10) of dielectric material having a refractive index n2. Such an optically-transparent device is configured for forming a field intensity distribution in a near zone of said device, from electromagnetic waves incidentally illuminating said device, when said device is embedded in a dielectric material having …
- Who is the assignee on this patent?
- Interdigital Ce Patent Holdings, Interdigital Ce Patent Holdings Sas
- What technology area does this patent fall under?
- Primary CPC classification G02B27/56. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jul 23 2024 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).