Related Experiment Video
Updated: Jun 16, 2026
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
Optical tolerances and electric fields in resonant reflectors
Applied Optics
|January 23, 2010
Summary
Achieving high reflectivity in resonant reflectors requires precise element thickness equality and spacer parallelism. Manufacturing complex multilayer devices presents significant challenges for practical applications.
Area of Science:
- Optical Engineering
- Materials Science
Background:
- Resonant reflectors are crucial optical components.
- Their performance depends on precise physical characteristics.
Purpose of the Study:
- To investigate the impact of dimensional variations on resonant reflector performance.
- To analyze the sensitivity of reflectivity to element and spacer imperfections.
- To evaluate factors influencing radiation damage susceptibility.
Main Methods:
- Matrix method calculations for reflectivity vs. wavelength.
- Simulations of element thickness variations in multi-element resonators.
- Experimental validation using two-element devices.
- Mapping relative electric field strengths within the reflector.
Main Results:
- Element thickness equality is critical, especially for two-element devices.
- Spacer parallelism significantly affects performance.
- For multi-element devices, center element thickness is less critical than overall error.
- Field strength distribution predicts radiation damage sites.
Conclusions:
- Manufacturing high-performance resonant reflectors is challenging due to stringent dimensional tolerances.
- Experimental results confirm the sensitivity to thickness equality and nonparallelism.
- Understanding field distribution is key to mitigating radiation damage in optical devices.
Related Concept Videos
01:15Standing Electromagnetic Waves
Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
01:28Standing Waves in a Cavity
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:
01:27Electrostatic Boundary Conditions in Dielectrics
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
01:23Parallel Resonance
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:
01:24Characteristics of Series Resonant Circuit
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: