Resonant transmission of terahertz waves through metallic slot antennas on various dielectric substrates

Park, D.J.; Hong, J. T.; Park, J.K.; Choi, Soobong; Son, Byung Hee; Rotermund, Fabıan; Lee, S.; Ahn, Kwang Jun; Kim, D.S.; Ahn, Y. H.

doi:10.1016/j.cap.2012.11.018

Cited by 35 publications

(23 citation statements)

References 23 publications

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“…The modified effective dielectric constant ε due to the presence of the fungi in the ambient condition can be expressed as ε = ε eff + αN ( ε f −1), where ε eff is the effective dielectric constant without the deposition of fungi, N is the number of microorganisms, and α is the coefficient which is associated with the volume fraction of the fungi. Here, ε eff in the capacitance (and hence the resonant frequency) is influenced both by the dielectric constants of the substrate and the air41, in which we obtained ε eff = 6.4 from simulation results (See Supplementary Figure S5). From the relation , where f ( f 0 ) is the resonant frequency with (without) the deposition of the fungi, the frequency shift Δ f = f − f 0 leads to .…”

mentioning

confidence: 89%

Detection of microorganisms using terahertz metamaterials

Park

Hong

Choi

et al. 2014

Sci Rep

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297

206

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Microorganisms such as fungi and bacteria cause many human diseases and therefore rapid and accurate identification of these substances is essential for effective treatment and prevention of further infections. In particular, contemporary microbial detection technique is limited by the low detection speed which usually extends over a couple of days. Here we demonstrate that metamaterials operating in the terahertz frequency range shows promising potential for use in fabricating the highly sensitive and selective microbial sensors that are capable of high-speed on-site detection of microorganisms in both ambient and aqueous environments. We were able to detect extremely small amounts of the microorganisms, because their sizes are on the same scale as the micro-gaps of the terahertz metamaterials. The resonant frequency shift of the metamaterials was investigated in terms of the number density and the dielectric constants of the microorganisms, which was successfully interpreted by the change in the effective dielectric constant of a gap area.

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mentioning

confidence: 89%

Detection of microorganisms using terahertz metamaterials

Park

Hong

Choi

et al. 2014

Sci Rep

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297

206

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“…Various resonance modes such as inductive-capacitive (LC) resonance, dipole resonance, and quadruple resonance appear in the metamaterials when the circular current is generated by interacting with incident light. The properties of each resonance mode are mainly governed by geometrical factors such as periodicity, gap width, metal thickness, and side arm length [4,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, this enables us to use a very thin water layer, and hence, to overcome the difficulties caused by the strong water attenuation of THz waves [16]. For sensing applications, the effect of the geometrical parameters on the metamaterial resonance, such as the gap width, the metal thickness, and the substrate dielectric constant have been very important properties for device optimization [12][13][14]17]. In particular, the vertical extent of the sensing volume has been addressed in slot antenna structures and metamaterials.…”

Section: Introductionmentioning

confidence: 99%

Effective Sensing Volume of Terahertz Metamaterial with Various Gap Widths

Park

Yoon

Ahn

2016

Journal of the Optical Society of Korea

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We studied experimentally and theoretically the vertical range of the confined electric field in the gap area of metamaterials, which was analyzed for various gap widths using terahertz time-domain spectroscopy. We measured the resonant frequency as a function of the thickness of poly(methyl methacrylate) in the range 0 to 3.2 μm to quantify the effective detection volumes. We found that the effective vertical range of the metamaterial is determined by the size of the gap width. The vertical range was found to decrease as the gap width of the metamaterial decreases, whereas the sensitivity is enhanced as the gap width decreases due to the highly concentrated electric field. Our experimental findings are in good agreement with the finite-difference time-domain simulation results. Finally, a numerical expression was obtained for the vertical range as a function of the gap width. This expression is expected to be very useful for optimizing the sensing efficiency.

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“…The electromagnetic properties of the metamaterial consisting of array of metallic structures can be engineered by controlling shapes and sizes of the metallic structures. Slot structures are often used to build a metamaterial because their simple structure enables easy control of the desired operating frequency just by changing the length and width of the slot [2][3][4]. The slot can be modelled as a parallel LC resonant circuit due to the electric field confined around center of the slot and currents concentrated at the edge of the slots.…”

Section: Introductionmentioning

confidence: 99%

Terahertz metamaterial filter based on combinatory structures of slots and slits

Kim¹,

Jang²

2015

2015 IEEE 4th Asia-Pacific Conference on Antennas and Propagation (APCAP)

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Filter transform technique from a bandpass filter to bandstop filter is presented. By introducing the slits between the slots, original bandpass characteristics of the filter consisting of slots is changed to bandstop characteristics. Additional seriesconnected capacitance due to the slits plays a key role in the present filter transform. Electromagnetic simulation is carried out to compare the filter characteristics of the slot filters with and without slits.

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Resonant transmission of terahertz waves through metallic slot antennas on various dielectric substrates

Cited by 35 publications

References 23 publications

Detection of microorganisms using terahertz metamaterials

Detection of microorganisms using terahertz metamaterials

Effective Sensing Volume of Terahertz Metamaterial with Various Gap Widths

Terahertz metamaterial filter based on combinatory structures of slots and slits

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