Related Experiment Video
Updated: Sep 11, 2025
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
17.1K
Potentials with partly constant free spectral range and their application to SNAP microresonators
Optics Letters
|August 15, 2025
Summary
Surface nanoscale axial photonics (SNAP) microresonators can be tuned for specific spectral regions. This research explores new potential designs for constant free spectrum range (FSR) in SNAP microresonators, enhancing applications.
Area of Science:
- Photonics
- Optics
- Wave Mechanics
Background:
- Whispering gallery modes (WGM) in surface nanoscale axial photonics (SNAP) microresonators are key for optical applications.
- Current models often use a one-dimensional wave equation with fiber cutoff frequency (CF) as potential and light frequency as energy.
- SNAP microresonators with constant free spectrum range (FSR) are crucial for frequency comb generation, conversion, and signal processing.
Purpose of the Study:
- To investigate the utility of SNAP microresonator potentials with FSR confined to specific spectral regions.
- To analyze the properties of these spectrally confined FSR potentials in a semiclassical approximation.
- To determine if spectrally confined potentials are sufficient or preferable for certain applications compared to globally constant FSR.
Main Methods:
- Semiclassical approximation was used to describe and analyze the properties of spectrally confined FSR potentials.
- Representative examples of such potentials were considered for analysis.
- The study focuses on the theoretical description and analysis of these novel potential configurations.
Main Results:
- The study identifies that constant FSR confined within specific spectral regions can be sufficient or preferable for various applications.
- Analysis in semiclassical approximation provides insights into the behavior of these localized potentials.
- The findings suggest a more tailored approach to designing SNAP microresonators for specific optical tasks.
Conclusions:
- Spectrally confined FSR potentials offer a flexible alternative to globally constant FSR in SNAP microresonators.
- This approach allows for optimized performance in applications requiring precise spectral control.
- The research opens avenues for designing advanced photonic devices with tailored spectral characteristics.
Related Concept Videos
01:23Parallel Resonance
274
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:
274
01:24Characteristics of Series Resonant Circuit
323
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:
323
01:17NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences
917
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
917
01:14NMR Spectrometers: Resolution and Error Correction
775
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
775
01:26Resonance in an AC Circuit
2.1K
The property of an inductor makes it resist any change in the current passing through it, while the property of a capacitor is to build up the charge across its terminals. Hence, if an inductor and capacitor are connected in series, they have opposite effects on the relative phase between current and voltage. The current through the circuit undergoes forced oscillation at the frequency of the source. The resistance term in an R-L-C circuit acts as a damping term because power is dissipated...
2.1K
01:14Sound Waves: Resonance
2.7K
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...
2.7K