Refractory titanium nitride two-dimensional structures with extremely narrow surface lattice resonances at telecommunication wavelengths

Abstract

Regular arrays of plasmonic nanoparticles have brought significant attention over the last decade due to their ability to support localized surface plasmons (LSPs) and exhibit diffractive grating behavior simultaneously. For a specific set of parameters (i.e., period, particle shape, size, and material), it is possible to generate super-narrow surface lattice resonances (SLRs) that are caused by interference of the LSP and the grating Rayleigh anomaly. In this letter, we propose plasmonic structures based on regular 2D arrays of TiN nanodisks to generate high-Q SLRs in an important telecommunication range, which is quite difficult to achieve with conventional plasmonic materials. The position of the SLR peak can be tailored within the whole telecommunication bandwidth (from ≈ 1.26 μm to ≈ 1.62 μm) by varying the lattice period, while the Q-factor is controlled by changing nanodisk sizes. We show that the Q-factor of SLRs can reach a value of 2 × 103, which is the highest reported Q-factor for SLRs at telecommunication wavelengths so far. Tunability of optical properties, refractory behavior, and low-cost fabrication of TiN nanoparticles paves the way for manufacturing cheap nanostructures with extremely stable and adjustable electromagnetic response at telecommunication wavelengths for a large number of applications.

Fourier-plane investigation of plasmonic bound states in the continuum and molecular emission coupling

“…Therefore, there have been continuous interests on the suppression of radiative damping in plasmonic structures in various contexts [21][22][23]. For example, we notice that high Q factors in plasmonic nanostructures were achieved via surface lattice resonances [24][25][26][27][28][29][30]. More recently, the strong interaction between plasmonic and photonic modes have been theoretically investigated to form a hybrid plasmonic BIC in metallic nanostructures [31,32].…”

Collective lattice resonances in disordered and quasi-random all-dielectric metasurfaces

“…To the date, most of the studies have considered diffractive coupling between electric dipole (ED) oscillations and Wood-Rayleigh anomalies [27,28] in arrays of classic plasmonic NPs like Au or Ag. However, quite recently a significant attention has been turned to alternative plasmonic materials like indium-tinoxide [29], aluminum [30][31][32][33], transition metal nitrides [22,34,35], and nickel [36]. The use of these materials makes it possible to tailor a wavelength of collective lattice modes within a wide spectral range, from UV [31] to IR [35], or enable a magnetooptical activity [37,38] which paves the way to a rich variety of novel and promising applications.…”

Collective Lattice Resonances in All-Dielectric Nanostructures under Oblique Incidence

“…In this case, a majority of NPs are excited with the same phase, which results in ultra-narrow high-Q spectral features. CLRs have been well studied for nanostructures from plasmonic NPs for a long time [44][45][46][47][48][49][50][51][52][53][54][55][56], while the all-dielectric analogues have gained attention only a decade ago [57]. In contrast to plasmonic NPs (in most of the cases characterized by weak magnetic and strong electric responses), all-dielectric NPs with pronounced electric and magnetic optical resonances [58] give rise to a rich variety of tunable CLRs that emerge even in regular rectangular-shaped arrays [32].…”