Related Experiment Video
Updated: Oct 16, 2025

09:43
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
10.0K
Extraordinary transmission in an add-drop filter configuration driven by nonconservative coupling
Optics Letters
|October 15, 2021
Summary
Researchers developed a new nonconservative coupling method for microtoroid resonators. This technique enables controllable transmission peaks and may lead to applications in tunable light steering systems.
Area of Science:
- Photonics
- Quantum Optics
- Non-Hermitian Systems
Background:
- High Q factor microtoroid resonators are crucial for optical devices.
- Controlling light propagation in resonant systems is challenging.
Purpose of the Study:
- To propose a novel nonconservative coupling scheme for microtoroid resonators.
- To investigate the realization of controllable transmission peaks.
- To explore potential applications in light steering.
Main Methods:
- Utilizing an add-drop filter configuration for indirect driving of a passive microtoroid resonator.
- Introducing an active unit to provide additional nonconservative coupling.
- Analyzing the system's supermodes and scattering properties.
Main Results:
- Predicted extraordinary scattering points when a supermode becomes lossless.
- Demonstrated controllable transmission peaks by tuning nonconservative coupling strength and phase delay.
- Showcased the potential for lossless supermodes.
Conclusions:
- The proposed nonconservative coupling scheme offers precise control over resonator transmission.
- This research paves the way for tunable light steering applications.
- Non-Hermitian resonator systems show promise for advanced optical functionalities.
Related Concept Videos
Transmission-Line Differential Equations
460
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
460
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
1.2K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.2K
¹H NMR: Long-Range Coupling
2.0K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.0K
¹³C NMR: ¹H–¹³C Decoupling
1.3K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.3K
Active Filters
993
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
993
Passive Filters
688
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
688

