scispace - formally typeset
Search or ask a question
Topic

Transformation optics

About: Transformation optics is a research topic. Over the lifetime, 2687 publications have been published within this topic receiving 102378 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, a method to efficiently multiply or divide the orbital angular momentum (OAM) of light beams using a sequence of two optical elements is presented, where the key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular sector.
Abstract: We present a method to efficiently multiply or divide the orbital angular momentum (OAM) of light beams using a sequence of two optical elements. The key element is represented by an optical transformation mapping the azimuthal phase gradient of the input OAM beam onto a circular sector. By combining multiple circular-sector transformations into a single optical element, it is possible to multiply the value of the input OAM state by splitting and mapping the phase onto complementary circular sectors. Conversely, by combining multiple inverse transformations, the division of the initial OAM value is achievable by mapping distinct complementary circular sectors of the input beam into an equal number of circular phase gradients. Optical elements have been fabricated in the form of phase-only diffractive optics with high-resolution electron-beam lithography. Optical tests confirm the capability of the multiplier optics to perform integer multiplication of the input OAM, whereas the designed dividers are demonstrated to correctly split up the input beam into a complementary set of OAM beams. These elements can find applications for the multiplicative generation of higher-order OAM modes, optical information processing based on OAM beam transmission, and optical routing/switching in telecom.

40 citations

Journal ArticleDOI
TL;DR: In this paper, a parabolic reflector is converted into a flat one based on the discrete coordinate transformation, and the reflected emission through tuning transformed dielectrics is manipulated through tuning transformers.
Abstract: A conventional parabolic reflector is converted into a flat one based on the discrete coordinate transformation. Instead of general beam-steering techniques, such as off-axis feeding, tilting the feed/reflector, or utilizing phase shift, we show an alternative way to manipulate the reflected emission through tuning transformed dielectrics. The proposed design, only including the conventional dielectric components, has a merit of keeping the flat profile of a compact reflector system while possessing the ability to steer the radiation beams in a wide frequency band.

40 citations

Journal ArticleDOI
TL;DR: In this paper, a self-assembled metamaterial exhibiting a positive near-zero index of refraction at visible wavelengths is demonstrated, which may pave a way to simply and efficiently self-assemble and optically characterize multifunctional, multilayer nanoparticle-ligand metammaterials.
Abstract: A self-assembled metamaterial exhibiting a positive near-zero index of refraction at visible wavelengths is demonstrated. The metamaterial consists of thiolene-functionalized gold nanospheres self-assembled into macroscopic, crosslinked, monolayers. By measuring the real and imaginary parts of the phase shift of light transmitted through the self-assembled films the effective index of refraction is determined as a function of wavelength. These findings may pave a way to simply and efficiently self-assemble and optically characterize multifunctional, multilayer nanoparticle–ligand metamaterials.

40 citations

Journal ArticleDOI
TL;DR: In this paper, the negative refraction of metallic cut-wire metamaterials was investigated at the magnetically resonant transmission band, where the electric response is attributed to the plasma oscillation of electrons, and the magnetic response is originated from antiparallel currents induced resonantly in the neighboring edges of the concentric double rings.
Abstract: Metallic metamaterials, by periodically arranged double rings, without splits in both of them, are investigated to show their negative refraction at the magnetically resonant transmission band. It is verified that the negative refraction occurs in the transmission regime where the electric response is attributed to the plasma oscillation of electrons, in analogy to the metallic cut-wire metamaterials, and the magnetic response is originated from antiparallel currents induced resonantly in the neighboring edges of the concentric double rings.

40 citations

Journal ArticleDOI
TL;DR: In this paper, the authors demonstrate the change of the polarization of the electromagnetic wave induced by chiral metamaterials in the terahertz region and demonstrate that the metal screw hole arrays work as a strong optically active material.
Abstract: The authors demonstrate the change of the polarization of the electromagnetic wave induced by chiral metamaterials in the terahertz region. The polarization of the incident terahertz wave changes dramatically after transmitting through the chiral metamaterials made of the array of screw holes in metal slabs. A strong resonant polarization change (ellipticity and polarization azimuth) is observed at frequencies corresponding to the standing cavity modes of the metal waveguide with a finite length. Such experimental results indicate that the metal screw hole arrays work as a strong optically active material.

40 citations


Network Information
Related Topics (5)
Optical fiber
167K papers, 1.8M citations
87% related
Dielectric
169.7K papers, 2.7M citations
84% related
Laser
353.1K papers, 4.3M citations
83% related
Quantum dot
76.7K papers, 1.9M citations
83% related
Amplifier
163.9K papers, 1.3M citations
82% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202324
202269
202147
202070
2019100
201890