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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Reflection of Waves01:07

Reflection of Waves

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When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
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Time-reflection of microwaves by a fast optically-controlled time-boundary.

Thomas R Jones1, Alexander V Kildishev1, Mordechai Segev2

  • 1Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, USA.

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|August 8, 2024
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Scientists observed time-reflection of electromagnetic (EM) waves at a record 0.59 GHz frequency. This breakthrough provides experimental evidence for phase conjugation in time-reflected waves, advancing the study of photonic time-crystals.

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Area of Science:

  • Physics
  • Electromagnetism
  • Wave Phenomena

Background:

  • Electromagnetic (EM) waves undergo time-refraction and time-reflection when propagating through media with abrupt temporal property changes.
  • Time-reflection, unlike time-refraction, involves backward propagation with a conjugate phase, posing experimental challenges due to the need for rapid medium modulation.
  • Observing time-reflection of EM waves is difficult, requiring significant medium changes within a single wave cycle.

Purpose of the Study:

  • To experimentally observe time-reflection of microwave pulses at an unprecedentedly high frequency.
  • To provide experimental evidence for the phase-conjugation property of time-reflected waves.
  • To demonstrate a system capable of realizing Photonic Time-Crystals at Gigahertz frequencies.

Main Methods:

  • Utilized a periodically-loaded microstrip line.
  • Employed optically-controlled picosecond-switchable photodiodes for rapid medium modulation.
  • Generated and analyzed microwave pulses at 0.59 GHz.

Main Results:

  • Successfully observed time-reflection of microwave pulses at 0.59 GHz, the highest frequency reported to date.
  • Provided experimental validation of the phase-conjugation characteristics of time-reflected waves.
  • Demonstrated a novel experimental platform for studying temporal phenomena in EM waves.

Conclusions:

  • The experimental observation confirms the feasibility of achieving time-reflection at high frequencies.
  • The findings support the development of advanced electromagnetic devices and the exploration of Photonic Time-Crystals.
  • This work opens new avenues for manipulating EM waves through temporal control of medium properties.