Terahertz Metamaterial Modulators Based on Absorption

Zhou, Hao; Ding, Fei; Jin, Yi; He, Sailing

doi:10.2528/pier11061304

Cited by 36 publications

(15 citation statements)

References 38 publications

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“…(v) Thus, the ILWC values lower than ILWC th are not considered as precipitations, with exception of those detected by CR 1 . To the best of our knowledge, this criterion should be established Liquid Precipitation Parameter (RRR): Accumulated Rain in previous 6 h > 1 mm CR 3 Liquid Precipitation Parameter (RRR): Accumulated Rain in following 6 h > 1 mm as the most reliable identificator of presence of rain during a radiosounding.…”

Section: Description Of the Methodsmentioning

confidence: 99%

“…Within this range, a considerable research effort is currently concentrated on technological developments aiming to improve characteristics and performance of devices for emitter and receiver systems. A very important number of comprehensive reviews [1,2] on the state-of-the-art of THz technology [3][4][5] can be found in the literature . A non-exhaustive list of applications includes astronomy [6], security scanning [7], explosives detection [8], medical imaging and biology [9,10] and atmospheric remote sensing [11].…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric Propagation at 100 and 300 Ghz: Assessment of a Method to Identify Rainy Conditions During Radiosoundings

Soria¹,

Riera²,

Garcia‐del‐Pino³

et al. 2012

PIER

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Abstract-The influence of atmospheric gases and tropospheric phenomena becomes more relevant at frequencies within the THz band (100 GHz to 10 THz), severely affecting the propagation conditions. The use of radiosoundings in propagation studies is a well established measurement technique in order to collect information about the vertical structure of the atmosphere, from which gaseous and cloud attenuation can be estimated with the use of propagation models. However, some of these prediction models are not suitable to be used under rainy conditions. In the present study, a method to identify the presence of rainy conditions during radiosoundings is introduced, with the aim of filtering out these events from yearly statistics of predicted atmospheric attenuation. The detection procedure is based on the analysis of a set of parameters, some of them extracted from synoptical observations of weather (SYNOP reports) and other derived from radiosonde observations (RAOBs). The performance of the method has been evaluated under different climatic conditions, corresponding to three locations in Spain, where colocated rain gauge data were available. Rain events detected by the method have been compared with those precipitations identified by the rain gauge. The pertinence of the method is discussed on the basis of an analysis of cumulative distributions of total attenuation at 100 and 300 GHz. This study demonstrates that the proposed method can be useful to identify events probably associated to rainy conditions. Hence, it can be considered as a suitable algorithm in order to filter out this kind of events from annual attenuation statistics.

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Section: Description Of the Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atmospheric Propagation at 100 and 300 Ghz: Assessment of a Method to Identify Rainy Conditions During Radiosoundings

Soria¹,

Riera²,

Garcia‐del‐Pino³

et al. 2012

PIER

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show abstract

“…Although various components have been developed for THz applications [5][6][7][8][9][10][11][12][13][14][15][16][17][18], high power, low cost, and compact THz sources are not readily available [19]. With the rapid advancement of multi-physics based codes, which provide the possibility of simulating the nonlinear beam-wave interaction dynamics [20][21][22][23][24], extending the operating frequency of the existing microwave tube designs [25][26][27][28][29] has become a promising approach for developing compact and powerful THz sources [30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

DESIGN AND 3-D PARTICLE-IN-CELL SIMULATION OF A 140 GHz SPATIAL-HARMONIC MAGNETRON

Esfahani¹,

Tayarani²,

Schunemann³

2013

PIER

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Abstract-This paper discusses design procedure and 3-D numerical simulation of a 140 GHz spatial-harmonic magnetron (SHM). The well known scaling laws and an approximate approach based on single harmonic analysis are used to determine the interaction space dimensions and the optimum geometrical parameters of the side resonators. Numerical simulations of the SHM were performed using CST-Particle Studio. Since the simulations are not based on artificial RF priming or assuming restrictive assumptions on the mode of operation or on the number of harmonics to be considered, electromagnetic oscillations grow naturally from noise. The presented SHM shows stable operation in the π/2 − 1-mode at 140 GHz over a range of DC anode voltages extending from 11.3 kV to 11.5 kV and for an axial magnetic flux density equal to 0.79 T. Output power of the SHM varies from 2 kW to 11 kW over these voltages with a maximum efficiency of about 6.8%.

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“…The terahertz (THz) frequency region, which is loosely defined as 0.1-10 THz, has long been known as "the THz gap" although THz science and technology have made significant progress in the past decades [1][2][3][4]. The lack of suitable and efficient signal sources limits applications to a number of areas that demand highly reliable performance, ranging from molecular spectroscopy to astronomy, environmental monitoring, bio-imaging, and security screening [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Full-Wavelength Dipole Antenna on a Gaas Membrane Covered by a Frequency Selective Surface for a Terahertz Photomixer

Nguyen¹,

Ho²,

Han³

2012

PIER

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Abstract-An antenna consisting of a full-wavelength dipole on a GaAs membrane covered by a frequency selective surface is proposed for improved output power from photomixers used as terahertz (THz) sources. The antenna structure reduces the vertical dimension of a typical photomixer antenna using a substrate lens while still exhibiting high total efficiency and high directivity. The resulting antenna after optimization produced an input resistance of 3870 Ω and a radiation efficiency of 60%, corresponding to a total efficiency, i.e., the efficiency of the antenna in THz wave radiation, of approximately 48.3% and a maximum directivity of 20.2 dBi at the resonance frequency of 1.03 THz. The proposed antenna is expected to be a promising alternative THz photomixer design.

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Terahertz Metamaterial Modulators Based on Absorption

Cited by 36 publications

References 38 publications

Atmospheric Propagation at 100 and 300 Ghz: Assessment of a Method to Identify Rainy Conditions During Radiosoundings

Atmospheric Propagation at 100 and 300 Ghz: Assessment of a Method to Identify Rainy Conditions During Radiosoundings

DESIGN AND 3-D PARTICLE-IN-CELL SIMULATION OF A 140 GHz SPATIAL-HARMONIC MAGNETRON

Full-Wavelength Dipole Antenna on a Gaas Membrane Covered by a Frequency Selective Surface for a Terahertz Photomixer

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