Photon-trapping array for enhanced midwave infrared photoresponse

Silicon photonics in midwave and longwave infrared

Optical data communication is not the only area where silicon photonics will have an impact. Silicon and related group 4 crystals have excellent linear and nonlinear optical properties in the midwave and longwave infrared spectrum [1-6]. These properties, along with silicon’s excellent thermal conductivity and optical damage threshold, open up the possibility for a new class of midwave and long...

Low Absorption Liquid Crystal Materials for Midwave Infrared

3-Dimensional photonic crystal surface enhanced upconversion emission for improved near-infrared photoresponse.

The enhancement of upconversion luminescence of lanthanide-ion doped fluoride upconversion nanoparticles (UCNPs) is particularly important and highly required for their myriad applications in sensing, photoelectronic devices and bio-imaging. In this work, the amplification of luminescence in NaYF4:Yb/Er and NaYF4:Yb/Tm UCNPs in close proximity to the three-dimensional photonic crystal (3D PC) s...

Substrate-sensitive mid-infrared photoresponse in graphene.

We report mid-infrared photocurrent spectra of graphene nanoribbon arrays on SiO2 dielectrics showing dual signatures of the substrate interaction. First, hybrid polaritonic modes of graphene plasmons and dielectric surface polar phonons produce a thermal photocurrent in graphene with spectral features that are tunable by gate voltage, nanoribbon width, and light polarization. Second, phonon po...

A New Mechanism for Trapping of Photon

We propose a new mechanism for trapping bulk gauge field, giving rise to a massless photon on a flat Minkowski 3-brane in the Randall-Sundrum model in five space-time dimensions. The mechanism we propose employs the topological Higgs mechansim where a topological term and a 3-form gauge potential play an important role. This new mechanism might be considered as a gauge field’s analog of the loc...