4:15 PM - 4:30 PM
▲ [17p-A305-12] Numerical calculation of frequency conversion occurring by time-modulation of the permittivity of a homogeneous medium
Keywords:time-varying homogenous medium, modulation, metamaterials
Metamaterials are almost always designed in a time-harmonized scheme where wave propagation can be manipulated in space. Tuning the electromagnetic response of media in time to further control wave-material interactions in time has also attracted the scientific community's attention. The concept of temporally effective media in metamaterials is numerically investigated as a mechanism to create media with desirable effective permittivity. Similar to spatially subwavelength metamaterials [1-3], the proposed temporal metamaterial is a homogenous medium with effective relative permittivity that is varying with time. This report will present a numerical calculation of the time modulation of a homogeneous medium's permittivity. The achieved result supports the idea for the design and fabrication of active dynamic metamaterials for application in modulation frequency conversion and generation of an artificial light source.
Figure 1 describes the 2D physical model for the numerical calculation. TM electromagnetic wave polarized in the z-direction is excited at the left boundary propagating in the x-direction through a homogenous medium that has permittivity that is time-varying as a cosine function to time with the modulation frequency. λ is the wavelength of the incident wave. The length of the air layer is λ. The thickness and width of the time-varying homogenous medium are d and λ/2, respectively.
Figure 2 describes the modulation effect of electromagnetic waves by the time-varying homogenous medium with permittivity. Ey component of the incident wave is modulated after the wave propagates through the time-varying homogenous medium.
The authors would like to appreciate Dr. Satoshi Tomita, Dr. Seigo Ohno, and Dr. Nobuaki Kikuchi for the useful discussion. A part of this work was supported by JST, CREST Grant Number JPMJCR2102, Japan.
Figure 1 describes the 2D physical model for the numerical calculation. TM electromagnetic wave polarized in the z-direction is excited at the left boundary propagating in the x-direction through a homogenous medium that has permittivity that is time-varying as a cosine function to time with the modulation frequency. λ is the wavelength of the incident wave. The length of the air layer is λ. The thickness and width of the time-varying homogenous medium are d and λ/2, respectively.
Figure 2 describes the modulation effect of electromagnetic waves by the time-varying homogenous medium with permittivity. Ey component of the incident wave is modulated after the wave propagates through the time-varying homogenous medium.
The authors would like to appreciate Dr. Satoshi Tomita, Dr. Seigo Ohno, and Dr. Nobuaki Kikuchi for the useful discussion. A part of this work was supported by JST, CREST Grant Number JPMJCR2102, Japan.