Metafilm for loss-induced super-scattering and gain-induced absorption of electromagnetic wave

Patent metadata

Field	Value
Publication number	US-9500772-B2
Application number	US-201514961613-A
Country	US
Kind code	B2
Filing date	Dec 7, 2015
Priority date	Dec 11, 2014
Publication date	Nov 22, 2016
Grant date	Nov 22, 2016

Abstract

A metafilm is provided for operating on a photon at a defined wavelength, for super-scattering, absorption, and for laser absorber switch. The metafilm includes dimers and a conductive substrate for embedding the dimers in an array. Each dimer comprises a pair of a gain element and a loss element. The substrate, and the gain and loss elements have complex permittivity values. The metafilm super-scatters (e.g., lases) the photon in response to increasing the imaginary component of either the substrate or the loss element, and absorbs the photon in response to increasing the imaginary component of the gain element.

First claim

What is claimed is:

1. A metafilm for loss-induced super-scattering of a photon at a wavelength, comprising:
an electrically conductive substrate having a planar surface, a sub-wavelength thickness and a first complex permittivity; and
a plurality of dimers disposed in a planar array on said planar surface of said substrate, each dimer having a sub-wavelength period and including loss and gain elements separated by a sub-wavelength distance, each element having a sub-wavelength span and a sub-wavelength width along said planar array, said loss element having a second complex permittivity, said gain element having a third complex permittivity, wherein
said first, second and third complex permittivities respectively include first, second and third real components, and respectively include first, second and third imaginary components,
said second and third real components are equal,
said second imaginary component is higher than said third imaginary component, and
the metafilm emits the photon in response to increasing one of said first imaginary component and said second imaginary component.

2. The metafilm according to claim 1 , wherein absent stimulus said third imaginary component for said gain element is the negative of said second imaginary component for said loss element.

3. The metafilm according to claim 1 , wherein said loss element is one of a natural dielectric material and a composite dielectric material.

4. The metafilm according to claim 1 , wherein said gain element is one of a quantum dot and a quantum well.

5. The metafilm coating according to claim 1 , wherein said gain element is one of a semiconductor material and a fluorescent material.

6. The metafilm coating according to claim 1 , wherein said conductive substrate is composed of one of aluminum, gold, silver, copper palladium and tungsten.

7. The metafilm coating according to claim 1 , wherein said conductive substrate is a composite transparent conductive material.

8. The metafilm coating according to claim 1 , wherein super-scattering produces a lasing effect.

9. A metafilm for gain-induced absorption of a photon at a wavelength, comprising:
an electrically conductive substrate having a planar surface, a sub-wavelength thickness and a first complex permittivity; and
a plurality of dimers disposed in a planar array on said planar surface of said substrate, each dimer having a sub-wavelength period and including loss and gain elements separated by a sub-wavelength distance, each element having a sub-wavelength span and a sub-wavelength width along said planar array, said loss element having a second complex permittivity, said gain element having a third complex permittivity, wherein
said first, second and third complex permittivities respectively include first, second and third real components, and respectively include first, second and third imaginary components,
said second and third real components are equal,
said second imaginary component is higher than said third imaginary component, and
the metafilm absorbs the photon in response to increasing said third imaginary component.

10. The metafilm according to claim 9 , wherein absent stimulus said third imaginary component for said gain element is the negative of said second imaginary component for said loss element.

11. The metafilm according to claim 9 , wherein said loss element is one of a natural dielectric material and a composite dielectric material.

12. The metafilm according to claim 9 , wherein said gain element is one of a quantum dot and a quantum well.

13. The metafilm coating according to claim 9 , wherein said gain element is one of a semiconductor material and a fluorescent material.

14. The metafilm coating according to claim 9 , wherein said conductive substrate is composed of one of aluminum, gold, silver, copper palladium and tungsten.

15. The metafilm coating according to claim 9 , wherein said conductive substrate is a composite transparent conductive material.

16. A metafilm for switching operations with a photon at a wavelength, comprising:
an electrically conductive substrate having a planar surface, a sub-wavelength thickness and a first complex permittivity; and
a plurality of dimers disposed in a planar array on said planar surface of said substrate, each dimer having a sub-wavelength period and including loss and gain elements separated by a sub-wavelength distance, each element having a sub-wavelength span and a sub-wavelength width along said planar array, said loss element having a second complex permittivity, said gain element having a third complex permittivity, wherein
said first, second and third complex permittivities respectively include first, second and third real components, and respectively include first, second and third imaginary components,
said second and third real components are equal,
said second imaginary component is higher than said third imaginary component,
the metafilm switches from release of the photon to absorption of the photon by increasing said third imaginary component, and
the metafilm switches from absorption of the photon to release of the photon by increasing said second imaginary component.

17. The metafilm according to claim 16 , wherein absent stimulus said third imaginary component for said gain element is the negative of said second imaginary component for said loss element.

18. The metafilm according to claim 16 , wherein said loss element is one of a natural dielectric material and a composite dielectric material.

19. The metafilm according to claim 16 , wherein said gain element is one of a quantum dot and a quantum well.

20. The metafilm coating according to claim 16 , wherein said gain element is one of a semiconductor material and a fluorescent material.

21. The metafilm coating according to claim 16 , wherein said conductive substrate is composed of one of aluminum, gold, silver, copper palladium and tungsten.

22. The metafilm coating according to claim 16 , wherein said conductive substrate is a composite transparent conductive material.

Assignees

• Feng Simin
• Us Navy

Inventors

• Feng Simin

Classifications

• Y10S977/755

  Nanosheet or quantum barrier/well, i.e. layer structure having one dimension or thickness of 100 nm or less · CPC title

• Y10S977/774

  Exhibiting three-dimensional carrier confinement, e.g. quantum dots · CPC title

• H01S5/1046

  Comprising interactions between photons and plasmons, e.g. by a corrugated surface · CPC title

• G02B1/002 Primary

  made of materials engineered to provide properties not available in nature, e.g. metamaterials · CPC title