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Related Concept Videos

Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

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Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
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Parallel Resonance01:23

Parallel Resonance

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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:
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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.
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THz guided-mode resonance notch filter with variable filtering strength.

Hyeon Sang Bark1,2, Kyu-Ha Jang2, Kitae Lee2

  • 1Electrical and Electronics Engineering, Korea Maritime and Ocean University, Busan, 49112, Republic of Korea.

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|January 15, 2021
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We developed a terahertz (THz) guided-mode resonance (GMR) notch filter using a polyethylene terephthalate (PET) film. This filter offers tunable polarization-dependent and independent characteristics by adjusting the grating rotation angle.

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Area of Science:

  • Optics and Photonics
  • Terahertz Technology

Background:

  • Guided-mode resonance (GMR) filters offer precise optical filtering.
  • Terahertz (THz) technology requires efficient and tunable filtering components.

Purpose of the Study:

  • To propose a novel terahertz (THz) guided-mode resonance (GMR) notch filter.
  • To demonstrate tunable polarization-dependent and independent filtering characteristics.

Main Methods:

  • Fabrication of a monolithic polyethylene terephthalate (PET) film with a monolayer grating structure.
  • Investigation of filter performance by varying the rotation angle of a second grating film.
  • Analysis of transmittance spectra for different incident THz wave polarizations.

Main Results:

  • The proposed GMR notch filter exhibits polarization-dependent characteristics at a 0° rotation angle, with transmittance varying from 0.996 to 0.010.
  • Transmittance continuously decreases with increasing rotation angle, achieving polarization-independent filtering (0.065 ± 0.015) at 90°.
  • Enhanced transmittance was observed for incident polarization angles from 90° to 180° due to the vertical component enhancement of the THz wave.

Conclusions:

  • The developed THz GMR notch filter provides a versatile platform for tunable optical filtering.
  • The ability to switch between polarization-dependent and independent modes enhances its applicability in THz systems.
  • The results align with theoretical calculations, validating the proposed filter design.