Terahertz Optics.

Lee, Yun-Shik

doi:10.1007/978-0-387-09540-0_5

Cited by 213 publications

(179 citation statements)

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“…2. The design of both sections is chosen to have large optical non-linearity w (2) for DFG between the mid-infrared pumps. Referring to the band structure described in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…T erahertz (THz, l ¼ 30-300 mm) technology has proven that it can work in a laboratory setting, but there are few commercialized products because system-level components are large, complex and prohibitively expensive 1,2 . A major impediment towards widescale commercialization is the lack of an economical, compact, widely tunable mW-level THz source, particularly in 1-5 THz range.…”

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confidence: 99%

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Broadly tunable terahertz generation in mid-infrared quantum cascade lasers

et al. 2013

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Room temperature, broadly tunable, electrically pumped semiconductor sources in the terahertz spectral range, similar in operation simplicity to diode lasers, are highly desired for applications. An emerging technology in this area are sources based on intracavity difference-frequency generation in dual-wavelength mid-infrared quantum cascade lasers. Here we report terahertz quantum cascade laser sources based on an optimized non-collinear Cherenkov difference-frequency generation scheme that demonstrates dramatic improvements in performance. Devices emitting at 4 THz display a mid-infrared-to-terahertz conversion efficiency in excess of 0.6 mW W À 2 and provide nearly 0.12 mW of peak power output. Devices emitting at 2 and 3 THz fabricated on the same chip display 0.09 and 0.4 mW W À 2 conversion efficiencies at room temperature, respectively. High terahertzgeneration efficiency and relaxed phase-matching conditions offered by the Cherenkov scheme allowed us to demonstrate, for the first time, an external-cavity terahertz quantum cascade laser source tunable between 1.70 and 5.25 THz.

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“…2. The design of both sections is chosen to have large optical non-linearity w (2) for DFG between the mid-infrared pumps. Referring to the band structure described in Fig.…”

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Broadly tunable terahertz generation in mid-infrared quantum cascade lasers

et al. 2013

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“…Furthermore, recent developments in THz technologies [6,7] showed that THz waves could be a strong candidate for overcoming the obstacles associated with conventional explosives detection technologies, leading to extensive applications in security and military-related fields [7][8][9][10]. It should be noted that THz time-domain spectroscopy (THz-TDS) has been heavily utilized as the workhorse of the investigation of these capabilities of the THz regime, including the works on the detection and identification of both exposed and covered explosives through diffuse reflectance [11], investigation of the absorption spectra of numerous explosives and related compounds [12], and establishment of new spectral features within the frequency region of 3-6 THz [13,14].…”

Section: Introductionmentioning

confidence: 99%

Compound Explosives Detection and Component Analysis via Terahertz Time-Domain Spectroscopy

Choi¹,

Ryu²,

Kwon³

et al. 2013

Journal of the Optical Society of Korea

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We present qualitative and quantitative component analyses on compound explosives via Terahertz time-domain spectroscopy (THz-TDS) based on a combination of wavelet thresholding and wavelength selection. Despite its importance, the field of signal processing of THz signals of compound plastic explosives is relatively unexplored. In this paper, experiment results from explosives Composition B-3 and Pentolite are newly presented, suggesting a novel signal processing procedure for in situ compound explosives detection. The proposed signal processing method demonstrates effective component analysis even in noisy and humid environments, showing significant decrease in component concentration percentage error of approximately 22.7% for Composition B-3 and 48.8% for Pentolite.

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“…By dividing the Fourier transform of transmission through the sample by the Fourier transform of transmission through a reference substrate, the full complex transmission T (ω) as function of frequency can be obtained over a frequency range as broad as 100 GHz to 3.5 THz. Details can be found elsewhere [ [20][21][22]. The complex transmission is used to calculate the complex conductivity σ(ω) without the need for Kramers-Kronig transformation using the expression…”

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confidence: 99%

Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion systemCeFe2Ge2

Bosse

Pan

et al. 2016

Phys. Rev. B

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We present THz range optical conductivity data of a thin film of the near quantum critical heavy fermion compound CeFe2Ge2. Our complex conductivity measurements find a deviation from conventional Drude-like transport in a temperature range previously reported to exhibit unconventional behavior. We calculate the frequency dependent effective mass and scattering rate using an extended Drude model analysis. We find the inelastic scattering rate can be described by a temperature dependent power-law ω n(T ) where n(T ) approaches ∼ 1.0 ± 0.2 at 1.5 K. This is compared to the ρ ∼ T 1.5 behavior claimed in dc resistivity data and the ρ ∼ T 2 expected from Fermi-liquid theory. In addition to a low temperature mass renormalization, we find an anomalous mass renormalization that persists to high temperature. We attribute this to a Hund's coupling in the Fe states in a manner similar to that recently proposed in the ferro-pnictides. CeFe2Ge2 appears to be a very interesting system where one may study the interplay between the usual 4f lattice Kondo effect and this Hund's enhanced Kondo effect in the 3d states.

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Terahertz Optics.

Cited by 213 publications

References 0 publications

Broadly tunable terahertz generation in mid-infrared quantum cascade lasers

Broadly tunable terahertz generation in mid-infrared quantum cascade lasers

Compound Explosives Detection and Component Analysis via Terahertz Time-Domain Spectroscopy

Anomalous frequency and temperature-dependent scattering and Hund's coupling in the almost quantum critical heavy-fermion systemCeFe2Ge2

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