Abstract
In this paper, we explore the use of magnetic resonant metamaterials, so called metamagnetics, as dispersive elements for optical pulse shaping. We measure both positive and negative group delay dispersion (GDD) values in a metamagnetic material using the multiphoton interference phase scan (MIIPS) technique and show pulse temporal profiles numerically. The results are compared with finite element models. These GDD properties of metamagnetics, along with previously shown tunability and loss control with gain media, enable their use in ultrashort pulse optical applications.
Highlights
Metamaterials offer the potential to engineer optical responses for technological and scientific needs
We explore the use of magnetic resonant metamaterials, so called metamagnetics, as dispersive elements for optical pulse shaping
Future efforts will explore more advanced designs of metamaterials and perform group delay dispersion (GDD) measurements over a broader bandwidth of laser wavelengths to look at the effects of dispersion on even shorter pulses
Summary
Metamaterials offer the potential to engineer optical responses for technological and scientific needs. Media with negative permittivity and permeability have renewed discussions on the fundamental aspects of group velocity and its dispersion [1,2,3,4,5]. Metamaterials with custom reflectivity and group delay dispersion (GDD) are essential for many applications in ultrafast optics. Existing metamaterials enable new possibilities for GDD management, including tunable resonances of metamagnetics in the visible range [6] and loss compensated negative index materials [7]. Synthetic dispersion in metamaterials can be designed to either maximize or compensate GDD within a given band. We test a metamagnetic with engineered dispersion using a multiphoton interference technique and demonstrate that a desired phase step for shaping 10-15 fs pulses (spectrally centered around the magnetic resonance at 800 nm) can be achieved with a relatively thin 136-nm sample. By proving effective dispersion engineering at a nanoscale, our study brings realism to integrated ultrafast nanophotonics and coherent control
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