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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Bloch surface wave structures for high sensitivity detection and compact waveguiding.

Muhammad Umar Khan1, Brian Corbett1

  • 1Tyndall National Institute, University College Cork , Cork , Ireland.

Science and Technology of Advanced Materials
|November 24, 2016
PubMed
Summary
This summary is machine-generated.

Bloch surface waves (BSW) offer a sensitive, tunable alternative to surface plasmon resonance (SPR) sensing. These dielectric-based sensors enable integrated, multi-parameter silicon photonics applications.

Keywords:
201 Electronics / Semiconductor / TCOs204 Optics / Optical applications208 Sensors and actuators212 Surface and interfaces40 Optical, magnetic and electronic device materials505 Optical / Molecular spectroscopyBloch surface wavesDielectric multilayerLabel free sensingOptical sensorsPlanar optical circuitResonant sensorSurface sensingWaveguide sensorsilicon photonics

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Surface plasmon resonance (SPR) sensing faces limitations with fixed resonance and material constraints.
  • Dielectric multilayer stacks support Bloch surface waves (BSW), offering tunable optical properties.
  • BSW technology presents an alternative sensing platform with potential for waveguiding devices.

Purpose of the Study:

  • To review recent developments in Bloch surface wave (BSW) sensing technology.
  • To highlight the advantages of BSW sensors, particularly those using high index contrast layered structures.
  • To explore the integration of BSW sensors into silicon photonics platforms for advanced applications.

Main Methods:

  • Engineering dielectric multilayer stacks to control BSW resonant wavelength and polarization.
  • Utilizing the transparency of dielectric materials for monitoring surface-bound fluorescent molecules.
  • Investigating high index contrast layered structures for enhanced sensor performance.

Main Results:

  • BSW sensors demonstrate high sensitivity for refractive index monitoring.
  • Tunable resonance and longer propagation lengths are achieved through dielectric layer engineering.
  • Dielectric transparency enables efficient excitation and monitoring of fluorescent molecules.

Conclusions:

  • BSW technology offers a versatile and sensitive platform for refractive index sensing, surpassing SPR in tunability.
  • High index contrast structures and dielectric properties facilitate sharper resonances and waveguiding capabilities.
  • Integration with silicon photonics at 1550 nm enables compact, planar, multi-parameter sensing circuits.