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Related Concept Videos

Toroids01:27

Toroids

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A toroid is a closely wound donut-shaped coil constructed using a single  conducting wire. In general, it is assumed that a toriod consists of  multiple circular loops perpendicular to its axis.
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An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
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Parallel Resonance01:23

Parallel Resonance

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The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
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Fabrication of Silica Ultra High Quality Factor Microresonators
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Ultra-high-Q free-space coupling to microtoroid resonators.

Sartanee Suebka1, Euan McLeod1, Judith Su2,3

  • 1Wyant College of Optical Sciences, University of Arizona, Tucson, AZ, USA.

Light, Science & Applications
|March 16, 2024
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Researchers developed a new method to couple light into whispering gallery mode microtoroid resonators using free-space optics, overcoming limitations of fragile optical fibers for enhanced biochemical sensing applications.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Biochemical Sensing

Background:

  • Whispering gallery mode (WGM) microtoroid resonators offer high sensitivity for single-molecule detection.
  • Current laboratory use is limited by fragile, vibration-sensitive optical fiber tapers for light coupling.
  • Precise alignment is required for evanescent coupling, hindering practical applications.

Purpose of the Study:

  • To eliminate the need for optical fiber tapers in WGM microtoroid resonators.
  • To enable robust and practical implementation of WGM microtoroid resonators outside laboratory settings.
  • To enhance biochemical sensing capabilities through improved light coupling methods.

Main Methods:

  • Developed a free-space coupling technique using a long working distance objective lens and a digital micromirror device (DMD).
  • Light is injected and scattered light is collected via free-space optics.
  • Integrated with the frequency locked whispering evanescent resonator (FLOWER) for sensing experiments.

Main Results:

  • Achieved high Q-factors (quality factors) comparable to fiber-coupled systems.
  • Observed electromagnetically induced transparency (EIT)-like and Fano resonances in a single cavity.
  • Demonstrated robust temperature sensing and examined thermal nonlinear optical effects.

Conclusions:

  • Free-space coupling eliminates the need for fragile optical fibers, improving device robustness.
  • The large effective coupling area simplifies alignment and enhances positioning tolerance.
  • This approach provides a foundation for real-world applications of WGM microtoroid resonators.