Reflectin is a protein

Protein

Proteins are biochemical compounds consisting of one or more polypeptides typically folded into a globular or fibrous form, facilitating a biological function. A polypeptide is a single linear polymer chain of amino acids bonded together by peptide bonds between the carboxyl and amino groups of...

 originating from the Hawaiian Bobtail Squid

Hawaiian Bobtail Squid

Euprymna scolopes, also known as the Hawaiian Bobtail Squid, is a species of bobtail squid in the family Sepiolidae. It is native to the central Pacific Ocean, where it occurs in shallow coastal waters off the Hawaiian Islands and Midway Island...

, Euprymna scolopes, which is native to the central Pacific Ocean

Pacific Ocean

The Pacific Ocean is the largest of the Earth's oceanic divisions. It extends from the Arctic in the north to the Southern Ocean in the south, bounded by Asia and Australia in the west, and the Americas in the east.At 165.2 million square kilometres in area, this largest division of the World...

. Reflectins, a recently identified protein family that is enriched in aromatic

Aromaticity

In organic chemistry, Aromaticity is a chemical property in which a conjugated ring of unsaturated bonds, lone pairs, or empty orbitals exhibit a stabilization stronger than would be expected by the stabilization of conjugation alone. The earliest use of the term was in an article by August...

 and sulphur-containing amino acid

Amino acid

Amino acids are molecules containing an amine group, a carboxylic acid group and a side-chain that varies between different amino acids. The key elements of an amino acid are carbon, hydrogen, oxygen, and nitrogen...

s, are used by certain cephalopod

Cephalopod

A cephalopod is any member of the molluscan class Cephalopoda . These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles modified from the primitive molluscan foot...

s to manage and manipulate incident light in their environment.

It is thought that the biophysical properties of the highly reflective and self-organizing squid

Squid

Squid are cephalopods of the order Teuthida, which comprises around 300 species. Like all other cephalopods, squid have a distinct head, bilateral symmetry, a mantle, and arms. Squid, like cuttlefish, have eight arms arranged in pairs and two, usually longer, tentacles...

 protein will inform researcher

Researcher

A researcher is somebody who performs research, the search for knowledge or in general any systematic investigation to establish facts. Researchers can work in academic, industrial, government, or private institutions.-Examples of research institutions:...

s about the process of “bottom-up” synthesis of nanoscale structures

Photonic metamaterials

Photonic metamaterials, also known as Optical metamaterials, are a type of electromagnetic metamaterial, which are designed to interact with optical frequencies which are terahertz , infrared , and eventually, visible wavelengths. As a type of metamaterial, the periodic structures are made up of...

 and could lead to the development of thin-film coatings for microstructured materials, bringing scientists one step closer to the development of an invisbility cloak.

To this aim, various research groups are using so-called metamaterial

Metamaterial

Metamaterials are artificial materials engineered to have properties that may not be found in nature. Metamaterials usually gain their properties from structure rather than composition, using small inhomogeneities to create effective macroscopic behavior....

s, whose nanoscale properties alter the way in which their surfaces reflect visible light. Objects are visible because light bounces off them; Researchers have found that recombinantly expressed reflectin has revealed unanticipated self-assembling and behavioural properties which suggests that reflectin can be easily processed into thin films, photonic grating structures and fibres

Photonic-crystal fiber

Photonic-crystal fiber is a new class of optical fiber based on the properties of photonic crystals. Because of its ability to confine light in hollow cores or with confinement characteristics not possible in conventional optical fiber, PCF is now finding applications in fiber-optic...

. Theoretically, this makes it possible to develop a material which could cause incident light

Ray (optics)

In optics, a ray is an idealized narrow beam of light. Rays are used to model the propagation of light through an optical system, by dividing the real light field up into discrete rays that can be computationally propagated through the system by the techniques of ray tracing. This allows even very...

 to pass round it. This means that it could be used in a cloak that covers objects and renders them invisible. The current research was partly funded by DARPA (the research and development arm of the Pentagon

The Pentagon

The Pentagon is the headquarters of the United States Department of Defense, located in Arlington County, Virginia. As a symbol of the U.S. military, "the Pentagon" is often used metonymically to refer to the Department of Defense rather than the building itself.Designed by the American architect...

). It is thought the development of an invisibility cloak might be the ultimate aim of the project.