Related Experiment Video
Updated: Jul 29, 2025
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
11.3K
Whispering gallery mode microsphere resonator based on cylindrical air cavity coupling.
Optics Letters
|May 24, 2023
Summary
A novel optical fiber whispering gallery mode microsphere resonator was demonstrated using a unique cylindrical air cavity coupling method. This integrated device offers robust performance and high quality factor for advanced optical applications.
Area of Science:
- Optoelectronics
- Photonics
- Optical Resonators
Background:
- Whispering gallery mode (WGM) resonators are crucial for various photonic applications.
- Efficiently coupling light into microsphere resonators from optical fibers remains a challenge.
Purpose of the Study:
- To propose and demonstrate a novel optical fiber WGM microsphere resonator.
- To achieve efficient light coupling into a microsphere using a cylindrical air cavity.
Main Methods:
- Fabrication of a cylindrical air cavity using femtosecond laser micromachining and hydrofluoric acid etching.
- Integration of a microsphere into the cavity in tangential contact with the fiber core.
- Utilizing evanescent wave coupling for light transfer from fiber to microsphere.
Main Results:
- Demonstration of a highly integrated and robust WGM microsphere resonator.
- Achieved whispering gallery mode resonance via phase-matching condition.
- Obtained a high quality factor (Q) of 1.44 × 104.
Conclusions:
- The proposed cylindrical air cavity coupling method enables efficient light coupling into microsphere resonators.
- The device exhibits stability, low cost, and a good quality factor, suitable for practical applications.
- This work presents a promising approach for integrated optical fiber sensing and communication systems.
Related Concept Videos
01:28Standing Waves in a Cavity
966
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:
966
01:14Sound Waves: Resonance
2.6K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.6K
01:24Characteristics of Series Resonant Circuit
288
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:
288
01:23Parallel Resonance
234
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:
234
01:17Design Example: Underdamped Parallel RLC Circuit
342
Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
Starting with a fixed...
342
01:16Anatomy of the Ear
8.5K
Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
8.5K