4 research outputs found
Broadband Subwavelength Imaging Using a Tunable Graphene-Lens
Graphene as a one-atom-thick planar sheet can support surface plasmons at infrared (IR) and terahertz (THz) frequencies, opening up exciting possibilities for the emerging research field of graphene plasmonics. Here, we theoretically report that a layered graphene-lens (GL) enables the enhancement of evanescent waves for near-field subdiffractive imaging. Compared to other resonant imaging devices like superlenses, the nonresonant operation of the GL provides the advantages of a broad intrinsic bandwidth and a low sensitivity to losses, while still maintaining a good subwavelength resolution of better than λ/10. Most importantly, thanks to the large tunability of the graphene, we show that our GL is a continuously frequency-tunable subwavelength-imaging device in the IR and THz regions, thus allowing for ultrabroadband spectral applications
Additional file 1: of Human ring chromosome registry for cases in the Chinese population: re-emphasizing Cytogenomic and clinical heterogeneity and reviewing diagnostic and treatment strategies
Table S1. Chinese ring chromosome cases reported in the literature (XLSX 69 kb
Graphene-Enhanced Infrared Near-Field Microscopy
Graphene is a promising two-dimensional
platform for widespread
nanophotonic applications. Recent theories have predicted that graphene
can also enhance evanescent fields for subdiffraction-limited imaging.
Here, for the first time we experimentally demonstrate that monolayer
graphene offers a 7-fold enhancement of evanescent information, improving
conventional infrared near-field microscopy to resolve buried structures
at a 500 nm depth with λ/11-resolution
Hybrid Ghost Phonon Polaritons in Thin-Film Heterostructure
Ghost phonon polaritons (g-PhPs), a unique class of phonon
polaritons
in the infrared, feature ultralong diffractionless propagation (>20
μm) across the surface and tilted wavefronts in the bulk. Here,
we study hybrid g-PhPs in a heterostructure of calcite and an ultrathin
film of the phase change material (PCM) In3SbTe2, where the optical field is bound in the PCM film with enhanced
confinement compared with conventional g-PhPs. Near-field optical
images for hybrid g-PhPs reveal a lemniscate pattern in the momentum
distribution. We fabricated In3SbTe2 gratings
and investigated how different orientations and periodicities of gratings
impact the propagation of hybrid g-PhPs. As the grating period decreases
to zero, the wavefront of hybrid g-PhPs can be dynamically steered
by varying the grating orientation. Our results highlight the promise
of hybrid g-PhPs with tunable functionalities for nanophotonic studies