Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Control of enhanced THz transmission through metallic hole arrays using nematic liquid crystal

Ci-Ling Pan, Cho-Fan Hsieh, Ru-Pin Pan, Masaki Tanaka, Fumiaki Miyamaru, Masahiko Tani, and Masanori Hangyo

Open Access Open Access

Abstract

We demonstrate frequency tuning of enhanced THz radiation transmitted through a two-dimensional metallic hole array (2D-MHA) by controlling the index of refraction of the medium filling the holes and adjacent to the 2D-MHA on one side. The medium is a nematic liquid crystal (NLC) and its index of refraction is varied using magnetically controlled birefringence of the NLC. With the NLC, the peak transmission frequency of the 2D-MHA shift to the red by 0.112 THz and can be tuned from 0.193 to 0.188 THz. The peak transmittance is as high as 70% or an enhancement of 2.42 times, considering the porosity of the 2D-MHA. As a tunable THz filter, this device exhibits a continuous tuning range of 4.7 GHz, a low insertion loss of 2.35 to 1.55 dB and a quality factor of ~4–5.

©2005 Optical Society of America

Full Article  |  PDF Article
More Like This
Tunable transmission at 100 THz through a metallic hole array with a varying hole channel shape

Arvind Battula, Yalin Lu, R. J. Knize, Kitt Reinhardt, and Shaochen Chen
Opt. Express 15(22) 14629-14635 (2007)

Extraordinary transmission in metal hole array-photonic crystal hybrid structures

O. Glushko, R. Brunner, R. Meisels, S. Kalchmair, and G. Strasser
Opt. Express 20(15) 17174-17182 (2012)

Tunable and polarization-selective THz range transmission properties of metallic rectangular array with a varying hole channel shape

Wei Wang, Yalin Lu, R. J. Knize, Kitt Reinhardt, and Shaochen Chen
Opt. Express 17(9) 7361-7367 (2009)

View More...

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (6)
Fig.1.
Fig.1. Experimental setup. The inset shows construction of the 2D-MHA with a nematic liquid crystal, (NLC) 5CB infiltrated and as the substrate on one side.

Download Full Size | PDF

Fig. 2.
Fig. 2. Transmittance of the 2D-MHA sample before machining (thickness t=0.5 mm, black trace), after machining into a box-line structure (t=0.35 mm, red trace), boxed MHA with front and back Mylar sheets attached (blue trace), LC-filled MHA for o-ray (purple trace) and LC-filled MHA for e-ray (green trace).

Download Full Size | PDF

Fig. 3.
Fig. 3. The transmitted THz temporal waveforms of the tunable 2D-MHA sample with the 5CB layer aligned at several magnetic inclination angles θ (θ=0°, 15°, 30°, 45° and 55°) to the polarization direction of the THz wave. The relative time delay is clearly shown in the inset. The waveform of the incident or reference THz pulse (reduced by a factor of four) is also shown.

Download Full Size | PDF

Fig. 4.
Fig. 4. A close-up of the power spectra of THz signals transmitted through this device at various magnetic inclination angles.

Download Full Size | PDF

Fig. 5.
Fig. 5. The experimentally observed shift of the peak frequencies from Fig. 3(a) and the theoretical estimates are plotted as a function of the inverse of the effective index of refraction.

Download Full Size | PDF

Fig.6.
Fig.6. The peak transmittance of the 2D-MHA is plotted as a function of the inverse of the effective index of refraction of the LC.

Download Full Size | PDF

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

ν R = ν spp = ∣ k → in + G → ∣ c o 2 π ε m + ε d ε m ε d ,
ν R = ν spp ≅ ν diff n d ,
n d = { [ sin ⁡ 2 ( θ ) n o 2 + cos ⁡ 2 ( θ ) n e 2 ] − 1 2 } ,
Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use