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Related Concept Videos

Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
Fermi Level01:18

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.

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Related Experiment Video

Updated: Jun 29, 2026

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
07:20

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Versatile on-chip plasmonic lattices enabled by Kekulé metasurfaces.

Jinguo Liu1,2, Yufan Luo1, Airong Zhao3

  • 1College of Physics, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing, China.

Nature Communications
|November 26, 2025
PubMed
Summary

Researchers developed a novel Kekulé metasurface to precisely control optical lattices formed by surface plasmon polaritons (SPPs). This breakthrough enables new possibilities for secure optical communication and on-chip photonic devices.

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Area of Science:

  • Photonics and Nanotechnology
  • Optics and Optical Devices

Background:

  • Surface plasmon polaritons (SPPs) carry optical information, crucial for secure optical communication.
  • Controlling SPP lattice properties (intensity, spectral, spatial) is a significant challenge.

Purpose of the Study:

  • To develop a versatile Kekulé metasurface for creating tailored optical SPP lattices.
  • To demonstrate controllable spatial and intensity distributions of SPP lattices.
  • To explore applications in on-chip light emission and secure imaging.

Main Methods:

  • Theoretical and experimental development of Kekulé metasurfaces.
  • Utilizing noninvasive leakage radiation microscopy to visualize SPP lattices.
  • Superposing wing-shaped nanoslit sets to tailor lattice properties.

Main Results:

  • Demonstrated localization of SPPs into assorted optical lattices using Kekulé metasurfaces.
  • Successfully tailored spatial distribution and relative intensity of SPP lattice sites.
  • Showcased configurable on-chip light-emitter arrays and secure imaging encryption/decryption.

Conclusions:

  • Introduced a versatile Kekulé metasurface platform for generating well-defined SPP lattices.
  • Highlighted multiple degrees of freedom for controlling SPP lattices, enabling rich physical phenomena.
  • Paved the way for photonic elements with potential applications in existing technologies.