Controlling pulse dispersion in temporal and spectral domains are imperative for modern applications of ultrashort pulses in optical communications, opto-electronics and imaging. In this work we present the detailed study of ultrashort pulse dispersion in a hyperbolic metamaterial. This highly anisotropic structure comprised of plasmonic nanorods promises the flexibility in dispersion engineering beyond the capabilities of classical materials. We show experimentally and theoretically that the delicate balance between local and nonlocal effects play a crucial role in the optical response of the system leading to controlled switching between “superluminal” and stopped light propagation regimes of electromagnetic waves. We compare the effective medium simulations with full vectorial numerical analysis combining split-step Fourier method and finite difference time domain algorithm. The experimental studies were performed with 150 fs pulses in 560-740 nm spectral range. Using the high-resolution spectral interferometry, we were able to retrieve up to third-order dispersion terms of the metamaterial, confirming the theoretical predictions of pulse dynamics, and validate the strength of the effect. The dispersive properties of plasmonic nanorod metamaterials may play a crucial role in advanced dispersion compensation devices in telecommunication applications, supersensitive tuneable interferometers and slow light buffers in all optical systems.
Tomasz Stefaniuk, R. Margoth Córdova-Castro, Mazhar E. Nasir, and Anatoly V. Zayats, "Dispersion management in nanorod metamaterials (Conference Presentation)," Proc. SPIE 10671, Metamaterials XI, 106710P (Presented at SPIE Photonics Europe: April 24, 2018; Published: 23 May 2018); https://doi.org/10.1117/12.2309513.5788810660001.
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