Related Experiment Video
Updated: Jun 3, 2025
15:25
Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
6.1K
Chiral exceptional point enhanced active tuning and nonreciprocity in micro-resonators
Hwaseob Lee1, Lorry Chang1, Ali Kecebas2
1Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware, 19716, USA.
Light, Science & Applications
|January 9, 2025
Summary
Researchers explored chiral exceptional points (EPs) in microresonators using asymmetric scatterers. This enables tunable optical devices with applications in quantum information and optical interconnects.
Area of Science:
- Photonics and optical device engineering.
- Exploration of exceptional points (EPs) in microresonator systems.
Background:
- Exceptional points (EPs) are well-studied in various physical systems but their role in optical device tunability remains underexplored.
- Chiral exceptional points (chiral EPs) offer unique light control and enhanced sensor responsivity.
- Previous methods for achieving chiral EPs used symmetric Mie scatterers, offering stability but limiting dynamic tuning.
Purpose of the Study:
- To investigate the use of asymmetric Mie scatterers for deterministic thermal and electro-optic tuning across chiral exceptional points in microresonators.
- To demonstrate EP-mediated chiral optical nonlinear response.
- To explore the potential for wafer-scale manufacturing of chiral electro-optic modulators.
Main Methods:
- Fabrication of microresonators with asymmetric Mie scatterers to break rotational symmetry.
- Deterministic thermal tuning across a chiral exceptional point.
- Demonstration of electro-optic tuning and measurement of modulation contrast.
- Characterization of EP-mediated chiral optical nonlinear response.
Main Results:
- Successful deterministic thermal tuning across a chiral EP was achieved.
- Efficient electro-optic tuning was demonstrated, showing asymmetric modulation with up to 17 dB contrast.
- EP-mediated chiral optical nonlinear response was observed.
- The method is compatible with CMOS voltage levels and wafer-scale nano-manufacturing.
Conclusions:
- Asymmetric Mie scatterers provide a robust method for tuning microresonators across chiral exceptional points.
- This approach enables efficient electro-optic modulation and opens pathways for novel micro-resonator functionalities.
- The developed technology holds promise for applications in quantum information processing, light control, and optical interconnects.
Related Concept Videos
02:30Chirality in Nature
12.9K
Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
12.9K
01:12Double Resonance Techniques: Overview
190
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
190
01:23Parallel Resonance
186
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:
186
02:25Chirality
23.1K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
23.1K
01:14Sound Waves: Resonance
2.5K
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...
2.5K
00:58¹H NMR Chemical Shift Equivalence: Enantiotopic and Diastereotopic Protons
1.5K
Replacing each alpha-hydrogen in chloroethane by bromine (or a different functional group) yields a pair of enantiomers. Such protons are called prochiral or enantiotopic and are related by a mirror plane. Enantiotopic protons are chemically equivalent in an achiral environment. Because most proton NMR spectra are recorded using achiral solvents, enantiotopic hydrogens yield a single signal.
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
In chiral compounds such as 2-butanol, replacing the methylene hydrogens at C3 produces a pair of...
1.5K