Nanoscale photonics/plasmonics and integrated circuits
Light in optical and near-infrared frequencies reveals its intriguing properties when actively interacting with micro- and/or nanoscale structures, offering the opportunities to control and manipulate the behaviors of light. We explore various interesting optical phenomena taking place at nanoscale regime. In particular, we design and fabricate rational nanostructures to enhance light-matter interaction, investigate and characterize unique optical properties and exploit them to realize key elements in future photonic/plasmonic integrated circuits and related applications.
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Light scattering of nanowires
SEM image of the iron-nail shaped rod-type two-dimensional photonic crystal structures. High-index rods are InGaAsP/InP with multi-quantum wells.
(central emission ~1.55 mm)
Light in near infrared frequencies experiences photonic band structures that can enable us to actively engineer the optical properties.
Nature communications 7, 11569 (2016)
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Calculated photonic band structures of rod-type photonic crystals with different lattices
High-index semiconductor nanodisks are configured into an array of square lattice and embedded in flexible substrate that can enable the structure to be stretched and compressed by applying external force.
Three-dimensional transverse-electric-like dispersion surfaces near the first G-point photonic band edge change in response to the structural alterations, resulting in unique optical properties and serving as highly sensitive strain-gauge at the nanoscale regime.
Optics Express 24, 26119–26128 (2016)
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Graphene photodetector coupled with plasmonic nanowire waveguide
SEM image of the fabricated graphene SPP (surface plasmon polariton) detector integrated with a single Ag nanowire.
Two-dimensional spatial mapping of photocurrent distribution depending on the polarization angle of the incident laser.
Optics Letters 43, 2889–2892 (2018)