Nano-Meta Technologies News, Articles, Press Releases
A high-temperature durable broadband plasmonic absorber has been designed, fabricated, and optically characterized. An absorber with eficiency that exceeds 87% over the entire visible wavelength range, 400-800 nm, and a total thickness of 240 nm has been developed using a refractory plasmonic material titanium nitride (TiN). This absorber integrates both the plasmonic resonances and the dielectric-like loss. It opens a path to interesting applications such as solar thermophotovoltaics and optical circuits.
The key problem currently faced by plasmonics is related to material limitations. After almost two decades of extreme excitement and research largely based on the use of noble metals, scientists have come to a consensus on the importance of exploring alternative plasmonic materials to address application-specific challenges to enable new functional devices. Such a change in the motivation will undoubtedly lead to significant advancements in plasmonics technology transfer and could have a revolutionary impact on nanophotonic technologies in general. Here, we report on one of the approaches that, together with other new material platforms, mark an insightful technology-driven era for plasmonics. Our study focuses on transition metal nitrides as refractory plasmonic materials that exhibit appealing optical properties in the visible and near infrared regions, along with high temperature durability. We take heat-assisted magnetic recording as a case study for plasmonic technology and show that a titanium nitride antenna satisfies the requirements for an optically efficient, durable near field transducer paving the way to the next-generation data recording systems.
Promising designs and experimental realizations of devices with unusual properties in the field of plasmonics have attracted a great deal of attention. However, the high expectations for commercial technologies and products have not been met so far. A major roadblock has been the lack of robust, high performance, low cost plasmonic materials that can be easily integrated into established technologies such as microelectronics. This article provides an overview of alternative plasmonic materials for localized surface plasmon applications and focuses on transition metal nitrides, in particular, titanium nitride, which has recently been shown to be a high performance refractory plasmonic material that could replace and even outperform gold in various plasmonic devices. As a material compatible with biological environments and the semiconductor industry, titanium nitride possesses superior properties compared to noble metals such as high temperature durability, chemical stability, corrosion resistance, low cost and mechanical hardness. Learn more ...
Refractory materials are those characterized by high melting temperatures and chemical stability when heated above 2000°C. Applications based on refractory materials, usually nonmetallic, span a wide range of areas including industrial furnaces, space shuttle protective shields, and semiconductor technology. Metals have also been studied as refractories; however, the optical properties of refractory metals (e.g. tungsten) are not suitable for these metals to be used in high-temperature plasmonic applications (the latter are almost entirely based on noble metals, which do not possess high thermal stability). Refractory materials that exhibit pronounced plasmonic behavior would enable new devices and enhance such existing applications as heat-assisted magnetic data recording, solar/thermophotovoltaic power generation, plasmon-assisted chemical vapor deposition, and nanoscale heat transfer systems. Learn more ...
Titanium nitride (TiN) is a promising alternative (to traditional gold and silver) plasmonic material and it is known to exhibit localized surface plasmon resonance within the biological transparency window (approximately, 700-1300 nm: near-infrared). In the paper, local heating efficiencies of disk-shaped nanoparticles made of TiN and gold are compared in the visible and near-infrared spectral regions numerically and experimentally. It is shown that plasmonic TiN nanodisks are efficient local heat sources and that they outperform gold nanodisks in the biological transparency window. This eliminates the need for complex particle geometries that are required in order to position the surface plasmonic resonance frequency in the biological transparency window when gold nanoparticles are used. Learn more ...
Materials research plays a vital role in transforming breakthrough scientific ideas into next-generation technology. Similar to the way silicon revolutionized the microelectronics industry, the proper materials can greatly impact the field of plasmonics and metamaterials. Currently, research in plasmonics and metamaterials lacks good material building blocks in order to realize useful devices. Such devices suffer from many drawbacks arising from the undesirable properties of their material building blocks, especially metals. … This review provides a summary of the recent developments in the search for better plasmonic materials and an outlook of further research directions. … Continue reading
Broadband enhancement of spontaneous emission from nitrogen-vacancy centers in nanodiamonds by hyperbolic metamaterialsMay 3rd, 2013
A broadband enhancement of emission from nitrogen-vacancy centers in nanodiamonds has been demonstrated. The enhancement is achieved by using a multilayer metamaterial with hyperbolic dispersion. The metamaterial is fabricated as a stack of alternating gold and alumina layers. This approach approach paves the way towards the construction of efficient single-photon sources as planar on-chip devices … Continue reading
Metamaterials, or engineered materials with rationally designed, subwavelength-scale building blocks, allow us to control the behavior of lightr with flexibility and performance that are unattainable with naturally available materials. In turn, metasurfaces - planar, ultrathin metamaterials - extend these capabilities even further. Optical metasurfaces offer the fascinating possibility of controlling light with surface-confined, flat components. … Continue reading
Performance analysis of nitride alternative plasmonic materials for localized surface plasmon applicationsMarch 2012
The methods are considered to define the performance metrics for different plasmonic materials to be used in localized surface plasmon applications. Optical efficiencies are shown to be better indicators of performance as compared to approximations in the quasistatic regime. The near-field intensity efficiency, which is a generalized form of the well-known scattering efficiency, is a more flexible and useful metric for local-field enhancement applications. The evolution of the field enhancement from a particle surface to the far-field regime for spherical nanoparticles with varying radii is also examined. Titanium nitride and zirconium nitride, which were recently suggested as alternative plasmonic materials in the visible and near-infrared ranges, are compared to the performance of gold. In contrast to the results from quasistatic methods, both nitride materials are very good alternatives to the usual plasmonic materials. Learn more ...
Photonic-crystal-fiber-coupled photoluminescence interrogation of nitrogen vacancies in diamond nanoparticlesMarch 1st, 2012
A photonic-crystal fiber is used to demonstrate a fully fiber-integrated optical interrogation of nitrogen vacancies in diamond nanoparticles, where both pump radiation and the photoluminescent response of nitrogen vacancies are coupled to the fiber modes. A properly designed fiber is … Continue reading
Several different types of nanodiamonds were characterized in order to find the best sample to be used in further experiments with metamaterials. In this work we present the results of optical analysis of aqueous suspensions containing nanodiamonds, SEM analysis of … Continue reading