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Related Concept Videos

Non-ohmic Devices00:51

Non-ohmic Devices

In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
Consider a simple circuit consisting of a battery, a diode, and a resistor. A diode...
Characteristics of Series Resonant Circuit01:24

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
Series Resonance01:17

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The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
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Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...

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Related Experiment Video

Updated: May 24, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators
07:51

Fabrication of Silica Ultra High Quality Factor Microresonators

Published on: July 2, 2012

Power insensitive silicon microring resonators.

Lian-Wee Luo1, Gustavo S Wiederhecker, Kyle Preston

  • 1School of Electrical and Computer Engineering, Cornell University, Ithaca, New York 14853, USA. ll399@cornell.edu

Optics Letters
|February 21, 2012
PubMed
Summary
This summary is machine-generated.

We developed power-insensitive silicon microring resonators that passively control resonance. This breakthrough improves cavity energy handling by over fivefold, eliminating the need for active feedback control.

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Area of Science:

  • Photonics
  • Materials Science
  • Optical Engineering

Background:

  • Silicon microring resonators are key components in integrated photonics.
  • Their performance is often limited by power-dependent resonance shifts.
  • Active feedback control is typically required to mitigate these effects.

Purpose of the Study:

  • To demonstrate a novel silicon microring resonator design with inherent power insensitivity.
  • To eliminate the need for active feedback control in microring resonator devices.
  • To enhance the energy handling capabilities of microring resonators.

Main Methods:

  • Utilizing the compensation between free carrier dispersion blueshift and thermo-optic redshift.
  • Fabricating silicon microring resonators based on this passive control mechanism.
  • Characterizing the resonant wavelength shift under varying power levels.

Main Results:

  • Demonstrated power-insensitive silicon microring resonators without active feedback.
  • Achieved resonance stability with wavelength shifts less than one linewidth for dropped power up to 335 μW.
  • Reported a greater than fivefold improvement in cavity energy handling capability compared to conventional microrings.

Conclusions:

  • Passive control of resonance is achievable through the compensation of opposing optical effects.
  • The developed microring resonators offer significantly enhanced performance and robustness.
  • This technology paves the way for more stable and efficient silicon photonic devices.