20 August 2019

[Photonic] – Plasmonic-Photonic Crystals Studied to Further Sensor, Laser Research

Home / News / [Photonic] – Plasmonic-Photonic Crystals Studied to Further Sensor, Laser Research
Flèche contenu
PCCs - Codex International

As part of their research into optical states of plasmonic-photonic crystals (PPCs), scientists at Kazan Federal University investigated three-dimensional opal-like plasmonic-photonic crystals (OLPPCs), focusing on why OLPPCs do not admit light of certain wavelengths. (This is called the photonic bandgap — it is the range of light wavelengths where propagation through a crystal is difficult).
The primary conditions for passing a light beam with the wavelength of the photonic bandgap and a certain polarization through an OLPPC are the continuity of the gold layer, with a thickness of about 40 nm, and the use of polarized light, said the team.

The researchers modeled light transmission through photonic crystals with a continuous gold layer on their surfaces. They modeled different versions of PPCs and were able to define the conditions of existence of a polarization-sensitive photonic bandgap transmission peak in the OLPPC. They also studied the condition of efficient excitation of the hybrid plasmonic-photonic mode in such structures.

The researchers found that transmittance of light across a PPC was accompanied by excitations of the optical Tamm states. One-dimensional PPCs had light transmission pass bands inside the photonic bandgap in both polarizations, but 3D PPCs did not have light transmission pass bands inside the photonic bandgap, they said, because of a noncontinuous gold layer (shaped like separate nanocaps or nanocrescents on the surface of a PPC). The OLPPCs that were studied had a light transmission pass band inside the photonic bandgap with certain polarization, due to the excitation of the hybrid mode of the optical states.

Discover Also
[Nanotechnology] – NIST-led team develops tiny low-energy device to rapidly reroute light in computer chips 26 November 2019

Researchers at the National Institute of Standards and Technology (NIST) and their colleagues have developed an optical switch that routes light from one computer chip to another in just 20 billionths of a second — faster than any other similar device. The compact switch is the first to operate at voltages low enough to be integrated onto low-cost silicon chips and redirects light with very low signal loss.

Read more
[Spintronics] – Topological materials outperform through quantum periodic motion 21 February 2020

Scientists at the U.S. Department of Energy’s Ames Laboratory have discovered that applying vibrational motion in a periodic manner may be the key to preventing dissipations of the desired electron states that would make advanced quantum computing and spintronics possible (npj Quantum Materials, “Light Control of Surface-Bulk Coupling by Terahertz Vibrational Coherence in a Topological Insulator”).

Read more