High-efficiency THz modulator based on phthalocyanine-compound organic films

He, Ting; Zhang, Bo; Shen, Jingling; Zang, Mengdi; Chen, Tianji; Hu, Yufeng; Hou, Yanbing

doi:10.1063/1.4907651

Cited by 48 publications

(15 citation statements)

References 32 publications

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“…Several types of hybrid Si structures have exhibited higher and faster THz wave modulation compared to bare Si at low laser irradiance141718, because energy band bending, which causes the drift of excited photocarriers towards the interface, occurs at the interface between Si and deposited materials. The conductivity at each region (Si, deposited materials, and the interface) naturally varies so that the photocarriers accumulate at the interface that gives a higher carrier density and an increase in THz wave absorption via electron–hole scattering, electron–phonon scattering, and electron–impurity scattering, which finally enhances the THz amplitude modulation than from both bare Si and the deposited material itself16.…”

Section: Resultsmentioning

confidence: 99%

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All-optical THz wave switching based on CH3NH3PbI3 perovskites

Lee

Kang

Son

et al. 2016

Sci Rep

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Hybrid structures of silicon with organic–inorganic perovskites are proposed for optically controllable switching of terahertz (THz) waves over a broad spectral range from 0.2 to 2THz. A 532-nm external laser was utilized to generate photoexcited free carriers at the devices and consequentially to control the terahertz amplitude modulation, obtaining a depth of up to 68% at a laser irradiance of 1.5 W/cm2. In addition, we compared the performances from three types of perovskite devices fabricated via different solution processing methods and suggested a stable and highly efficient THz switch based on a one-step processing. By this we demonstrated the possibility of perovskites as THz wave switching devices in addition to photovoltaics.

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Section: Resultsmentioning

confidence: 99%

“…Zhang et al . have demonstrated optically controlled THz amplitude modulators with modulation depths (MD) of up to nearly 100% using a polymer and an organic film as deposited materials on a Si substrate with external laser pumping at a wavelength of 400 nm161718.…”

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confidence: 99%

All-optical THz wave switching based on CH3NH3PbI3 perovskites

Lee

Kang

Son

et al. 2016

Sci Rep

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“…Many other materials showing dynamic THz responses applicable to active THz modulation also exist, such as NbO 2 , [211] InSb, [212,213] QWs, [214] titanium oxides, [215] orthoferrites, [216][217][218] rare-earth nickelates, [219][220][221] manganites, [222][223][224] topological insulators, [225][226][227] multiferroics, [228] molecular crystals, [229,230] medicines, [231] polymers, [232][233][234][235][236][237][238] and halide perovskites, [239][240][241][242][243][244][245][246] to name but a few. Considering the diversity of the material properties and the control mechanisms, plasmonic hybridization may bring about new possibilities for a wide variety of active THz devices.…”

Section: Potential Candidatesmentioning

confidence: 99%

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

Jeong

Bahk

Kim

2019

Advanced Optical Materials

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Phase‐change phenomena have been an attractive research theme for decades due to the dynamic transition of material properties providing extraordinary capabilities for versatile optical device applications. Even at the terahertz (THz) frequency regime, phase‐change materials (PCMs) promote the development of dynamic devices, especially when combined with a plasmonic approach delivering strong field enhancement and localization. According to the design of plasmonic metamaterials or hybrid composites, PCMs can actively modulate the electromagnetic properties of THz waves through thermal, electrical, and optical means. In turn, THz waves can affect the PCM properties in the nonlinear regime due to the intense field strength enhancement by plasmonic structures. Here, a few types of PCMs demonstrating promising potential in THz plasmonic applications are introduced. Starting from the best‐known transition metal oxide, vanadium dioxide (VO2), which possesses an insulator‐to‐metal phase transition near room temperature, superconductors, chalcogenides, ferroelectrics, liquid crystals, and liquid metals are covered along with their phase‐change properties and the control mechanisms infused with THz plasmonic applications. The corresponding recent progress presenting how PCMs combined with plasmonic structures can demonstrate effective THz modulation is reviewed. This general overview may provide a better understanding of dynamic THz plasmonics and new ideas for future THz technology.

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“…Vast potential for future development was obtained in many areas such as military, medical, security checks, astronomy, and more [11][12][13][14][15][16]. Many types of THz functional devices have been disclosed, such as phase shifters [17,18], optical switches [19,20], sensors [21,22], modulators [23,24], and detectors [25].…”

Section: Introductionmentioning

confidence: 99%

A High-Resolution Terahertz Electric Field Sensor Using a Corrugated Liquid Crystal Waveguide

Gong

Fan

2019

Crystals

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Liquid crystals (LCs) can always reflect variable optical properties in a broad terahertz (THz) band under external electric or magnetic fields. Based on the measurements of these varying properties, we can realize electric and magnetic field sensing with very high sensitivity. Here, we theoretically and numerically demonstrate a type of electric field sensor in the THz frequency range based on the defect mode arising in a periodically corrugated waveguide with liquid crystals. The Bragg defect structure consisting of periodically corrugated metallic walls and a defect in the middle can provide a narrow transmitted peak with controllable bandwidth, which can be used for external field sensing when it is filled with LCs. The molecular orientation of nematic LCs (E7) is not only very sensitive to the applied DC electric field but also very crucial to the effective refractive index of E7. Changing the effective index can efficiently shift the frequency of the transmitted peak in the THz spectrum. The simulated results show that the sensitivity can reach as high as 9.164 MHz/(V/m) and the smallest resolution is 0.1115 V/m. The proposed sensor and its significant performance could benefit electric field sensing and extend the applications of THz technology.

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High-efficiency THz modulator based on phthalocyanine-compound organic films

Cited by 48 publications

References 32 publications

All-optical THz wave switching based on CH3NH3PbI3 perovskites

All-optical THz wave switching based on CH3NH3PbI3 perovskites

Dynamic Terahertz Plasmonics Enabled by Phase‐Change Materials

A High-Resolution Terahertz Electric Field Sensor Using a Corrugated Liquid Crystal Waveguide

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