Temporal multi-stage energy pumping
Abstract
As an important theoretical concept, temporal boundaries provide researchers with new insights for tailoring electromagnetic waves in the time domain. Because a temporal boundary breaks the time translation symmetry, a source is necessary to satisfy energy conservation. In this Letter, we quantify the relationship between refractive index contrast and the required energy exchange. More specifically, to realize a temporal boundary with a large refractive index contrast, a correspondingly large and abrupt energy exchange is required. Considering this practical difficulty, we propose to mimic a large-contrast temporal boundary by staggering a series of small-contrast temporal boundaries separated by carefully designed durations. In this way, the process of energy input/output is distributed over an elongated duration, but their effect can still be cumulative. This process is analogous to a multi-resonant system with a periodic energy input. Based on this design principle, we discuss several scenarios for different temporal profiles of refractive index and their corresponding energy requirements.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 05, 2022
- Source ID
- 10.1364/ol.452056
Entities
People
- Douglas H. Werner
- Jingwei Xu
- Wending Mai
Organizations
- Defense Advanced Research Projects Agency
- Pennsylvania State University