# US 11,079,652 B2 · Omniresonant broadband coherent perfect absorption (CPA) apparatus, method, and applications

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- Number: US 11,079,652 B2
- Document ID: US11079652B2
- Status: Granted
- Kind: B2
- Application number: 16/119,348
- Filed: 2018-08-31
- Published: 2019-02-28
- Granted: 2021-08-03
- Earliest claimed: 2017-08-31
- Assignees: University of Central Florida Research Foundation, Inc.
- Applicants: University of Central Florida Research Foundation, Inc.
- Inventors: Ayman F. Abouraddy; Ali Kazemi Jahromi; Massimo L. Villinger; Ahmed El Halawany; Soroush Shabahang; Hasan Esat Kondakci
- Web page: https://patentgrep.com/patent/US11079652B2

## CPC

- G02F 1/21: by interference
- G02F 1/0126: {Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass}
- G02F 1/213: {Fabry-Perot type}
- G02F 2203/05: wavelength dependent
- G02F 2203/15: involving resonance effects, e.g. resonantly enhanced interaction
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

The present disclosure is directed to systems and methods for omniresonant broadband coherent perfect absorption of incoherent light over large bandwidths. The apparatus and methods that enable 100% effective optical absorption in a structure, irrespective of the material from which it is constructed, over a large, continuous bandwidth (omniresonance) in ultrathin devices. Specifically, we demonstrate achromatic optical absorption (omniresonance) in a planar Fabry-Pérot micro-cavity via angularly multiplexed phase-matching. By assigning each wavelength to an appropriate angle of incidence, the micro-cavity is rendered absorbing with continuous spectral range. For example, the linewidth of a single-order 0.7 nm wide resonance is de-slanted in spectral-angular space to become a 70 nm wide achromatic resonance spanning multiple cavity free spectral ranges. The embodied invention can have important applications in, e.g., harvesting solar energy, white-light micro-lasers, and other broadband resonantly enhanced optical effects.

## Claims

### Claim 1

An omniresonant broadband coherent perfect absorption (CPA) apparatus, comprising:
a light diffracting component;
a lens L1; and
an omniresonant optical cavity, disposed along an optical axis,
wherein the omniresonant optical cavity is disposed tilted at an angle, ψ, with respect to the optical axis,
further wherein an angle γ(λ) is a diffraction angle of a white-light input to the diffraction component with respect to a light diffracting component normal,
wherein γ(λ)−γo is the angle that any wavelength λ makes with respect to the optical axis,
wherein γ(λ) is within a range from 12 degrees to 70 degrees and γ0 is within a range from 45 degrees to 65 degrees,
wherein a central wavelength λc is diffracted at γo=γ(λc=550 nm) and coincides with the optical axis,
wherein the incidence angle made by the wavelength λ after the lens with respect to the optical axis is
φ
⁡
(
λ
)
=
tan
-
1
⁢
{
d
1
d
2
⁢
tan
⁡
(
γ
⁡
(
λ
)
-
γ
o
)
}
,
where d1 and d2 are the distances from the light diffracting component to the lens L1 and from the lens L1 to the cavity, respectively, such that the condition θ(λ)=φ(λ)+ψ is satisfied.

### Claim 2 (depends on 1)

The omniresonant broadband CPA apparatus of claim 1, wherein the omniresonant optical cavity comprises an absorbing layer embedded between a CPA-inducing front mirror and a fully reflective back mirror.

### Claim 3 (depends on 2)

The omniresonant broadband CPA apparatus of claim 2, wherein the CPA-inducing front mirror and the fully reflective back mirror are bilayer Bragg mirrors.

### Claim 4 (depends on 1)

The omniresonant broadband CPA apparatus of claim 1, wherein the light diffracting component is a grating.

### Claim 5 (depends on 1)

The omniresonant broadband CPA apparatus of claim 1, wherein a focal length of L1 is f, and d2=fd1/(f−d1).

### Claim 6

A method for omniresonant transmission, comprising the steps of:
providing an omniresonant broadband apparatus having a light diffracting component, a lens L1, and an omniresonant optical cavity, disposed along an optical axis, wherein the omniresonant optical cavity is disposed tilted at an angle, ψ, with respect to the optical axis;
inputting a white-light input to the diffraction component with respect to a light diffracting component normal having a diffraction angle γ(λ);
wherein γ(λ)−γo is the angle that any wavelength λ makes with respect to the optical axis;
wherein γ(λ) is within a range from 12 degrees to 70 degrees and γ0 is within a range from 45 degrees to 65 degrees;
diffracting a central wavelength λc at γo=γ(λc=550 nm), which coincides with the optical axis;
wherein the incidence angle made by the wavelength λ after the lens with respect to the optical axis is
φ
⁡
(
λ
)
=
tan
-
1
⁢
{
d
1
d
2
⁢
tan
⁡
(
γ
⁡
(
λ
)
-
γ
o
)
}
,
where d1 and d2 are the distances from the light diffracting component to the lens L1 and from the lens L1 to the cavity, respectively, such that the condition θ(λ)=φ(λ)+ψ is satisfied.

### Claim 7 (depends on 6)

The omniresonant broadband transmission apparatus of claim 6, wherein the omniresonant optical cavity comprises two symmetric bilayer Bragg mirrors with a dielectric spacer therebetween.

### Claim 8 (depends on 7)

The omniresonant broadband transmission apparatus of claim 7, wherein the dielectric spacer is composed of SiO2.