A group of scientists from ITMO University in Saint Petersburg has put forward a new approach to effective manipulation of light at the nanoscale based on hybrid metal-dielectric nanoantennas. The new technology promises to bring about a new platform for ultradense optical data recording and pave the way to high throughput fabrication of a wide range of optical nanodevices capable of localizing, enhancing and manipulating light at the nanoscale.
The results of the study were published in Advanced Materials.
Nanoantenna is a device that converts freely propagating light into localized light – compressed into several tens of nanometers. The localization enables scientists to effectively control light at the nanoscale. This is one of the reasons why nanoantennas may become the fundamental building blocks of future optical computers that rely on photons instead of electrons to process and transmit information. This inevitable replacement of the information carrier is related to the fact that photons surpass electrons by several orders of magnitude in terms of information capacity, require less energy, rule out circuit heating and ensure high velocity data exchange.
Until recently, the production of planar arrays of hybrid nanoantennas for light manipulation was considered an extremely painstaking process. A solution to this problem was found by researchers from ITMO University in collaboration with colleagues from Saint Petersburg Academic University and Joint Institute for High Temperatures in Moscow. The research group has for the first time developed a technique for creating such arrays of hybrid nanoantennas and for high-accuracy adjustment of individual nanoantennas within the array. The achievement was made possible by subsequently combining two production stages: lithography and precise exposure of thenanoantenna to a femtosecond laser – ultrashort impulse laser.
The practical application of hybrid nanoantennas lies, in particular, within the field of ultradense data recording. Modern optical drives can record information with density around 10 Gbit/inch2, which equals to the size of a single pixel of a few hundred nanometers. Although such dimensions are comparable to the size of the nanoantennas, the scientists propose to additionally control their color in the visible spectrum. This procedure leads to the addition of yet another ‘dimension’ for data recording, which immediately increases the entire data storage capacity of the system.
Apart from ultradense data recording, the selective modification of hybrid nanoantennas can help create new designs of hybrid metasurfaces, waveguides and compact sensors for environmental monitoring. In the nearest future, the research group plans to focus on the development of such specific applications of their hybrid nanoantennas.
The nanoantennas are made of two components: a truncated silicon cone with a thin golden disk located on top. The researchers demonstrated that, thanks to nanoscale laser reshaping, it is possible to precisely modify the shape of the golden particle without affecting the silicon cone. The change in the shape of the golden particle results in changing optical properties of the nanoantenna as a whole due to different degrees of resonance overlap between the silicon and golden nanoparticles.
“Our method opens a possibility to gradually switch the optical properties of nanoantennas by means of selective laser melting of the golden particles. Depending on the intensity of the laser beam the golden particle will either remain disc-shaped, convert into a cup or become a globe. Such precise manipulation allows us to obtain a functional hybrid nanostructure with desired properties in the flicker of a second,” comments Sergey Makarov, one of the authors of the paper and researcher at the Department of Nanophotonics and Metamaterials of ITMO University.
Contrary to conventional heat-induced fabrication of nanoantennas, the new method raises the possibility of adjusting individual nanoantennas within the array and exerting precise control over overall optical properties of the hybrid nanostructures.
“Our concept of asymmetric hybrid nanoantennas unifies two approaches that were previously thought to be mutually exclusive: plasmonics and all-dielectric nanophotonics. Our hybrid nanostructures inherited the advantages of both approaches – localization and enhancement of light at the nanoscale, low optical losses and the ability to control the scattering power pattern. In turn, the use of laser reshaping helps us precisely and quickly change the optical properties of such structures and perhaps even record information with extremely high density,” concludes Dmitry Zuev, lead author of the study and researcher at the Department of Nanophotonics and Metamaterials of ITMO University.
The Latest on: Hybrid nanoantennas
via Google News
The Latest on: Hybrid nanoantennas
- Researchers invent light-emitting nanoantennas on January 29, 2019 at 10:00 am
It can generate, enhance and route emission via excited resonant modes coupled with excitons. “We used hybrid perovskite as a material for such nanoantennas,” says Ekaterina Tiguntseva, first author o... […]
- Fabricated nanoantennas used to produce high-resolution holograms on November 24, 2018 at 4:00 pm
Researchers at Purdue University in Indiana have developed a different approach, in which a 3D image is stored in a structure of thousands of V-shaped nanoantennas etched ... a surface plasmon polarit... […]
- Suppression of photo-oxidation of organic chromophores by strong coupling to plasmonic nanoantennas on July 6, 2018 at 11:23 am
These intriguing hybrid states have been extensively studied over the past decades in a wide range of realizations aiming at both basic science and emerging applications. However, recently, it has bee... […]
- Final Report Summary - PHOTON-PLASMONHYB (Photonic-plasmonic hybrid for optical switching and biosensing application) on May 24, 2018 at 5:00 pm
To provide design rules for hybrid photonic-plasmonic structures using the example system of microring-nanoantenna - To demonstrate the practicality of the proposed hybrid structure in achieving optic... […]
- Low-Loss Dielectric Nanoantennas for Surface-Enhanced Spectroscopies and Nonlinear Photonics on December 10, 2017 at 4:00 pm
Dielectric nanoantennas have recently emerged as promising alternative ... 10-3% will be demonstrated for suitably engineered dielectric nanostructures. Finally, hybrid dielectric/metallic Si/Au nanoa... […]
- High-efficiency hybrid plasmonic metasurfaces on June 6, 2016 at 11:14 am
With our ultrathin hybrid structure we also counter-intuitively overturn ... Shalaev, Broadband light bending with plasmonic nanoantennas, Science 335, p. 427, 2012. 7. N. Yu, F. Aieta, P. Genevet, M. ... […]
- Hybrid nanoantennas—next-generation platform for ultradense data recording on May 2, 2016 at 3:05 am
Selective laser exposure to create hybrid nanostructures. Credit: ITMO University A group of scientists from ITMO University in Saint Petersburg has put forward a new approach to effective manipulatio... […]
- Hybrid nanoantennas — next-generation platform for ultradense data recording on April 28, 2016 at 8:21 am
A group of scientists from ITMO University in Saint Petersburg has put forward a new approach to effective manipulation of light at the nanoscale based on hybrid metal-dielectric nanoantennas. The new ... […]
- Next-generation platform for ultradense data recording on April 28, 2016 at 8:09 am
Until recently, the production of planar arrays of hybrid nanoantennas for light manipulation was considered an extremely painstaking process. The research group has developed a technique for creating ... […]
- Flexible nanoantenna arrays capture abundant solar energy on August 10, 2008 at 10:14 am
Researchers have devised an inexpensive way to produce plastic sheets containing billions of nanoantennas that collect heat energy ... as lightweight "skins" that power everything from hybrid cars to ... […]
via Bing News