Experimental and Theoretical Studies of a Broadband Superluminality in Fabry-Perot Interferometer

Yao, Hsin-Yu; Chang, Tsun-Hsu

doi:10.2528/pier11092707

Cited by 10 publications

(2 citation statements)

References 33 publications

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“…The ultra-wideband direction finding for conformal array antenna is still an extremely severe problem at present. The interferometer [25][26][27] direction-finding method is another kind of DOA estimation method which can be used for ultra-wideband direction finding [28][29][30][31]. The algorithm in [28] does not need a grid search.…”

Section: Introductionmentioning

confidence: 99%

A Low Energy Consumption DOA Estimation Approach for Conformal Array in Ultra-Wideband

et al. 2013

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Most direction-of-arrival (DOA) estimation approaches for conformal array suffer from high computational complexity, which cause high energy loss for the direction finding system. Thus, a low energy consumption DOA estimation algorithm for conformal array antenna is proposed in this paper. The arbitrary baseline direction finding algorithm is extended to estimate DOA for a conformal array in ultra-wideband. The rotation comparison method is adopted to solve the ambiguity of direction finding. The virtual baseline approach is used to construct the virtual elements. Theoretically, the virtual elements can be extended in the space flexibility. Four elements (both actual and virtual elements) can be used to obtain a group of solutions. The space angle estimation can be obtained by using sub-array divided technique and matrix inversion method. The stability of the proposed algorithm can be guaranteed by averaging the angles obtained by different sub-arrays. Finally, the simulation results verify the effectiveness of the proposed method with high DOA estimation accuracy and relatively low computational complexity.

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Section: Introductionmentioning

confidence: 99%

A Low Energy Consumption DOA Estimation Approach for Conformal Array in Ultra-Wideband

et al. 2013

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“…Fabry-Perot cavities have always received a great deal of interest in the realization of interferometric sensors due to their high sensitivity, simple structure and immunity to electromagnetic interference [1][2][3][4][5][6][7]. In recent works, Fabry-Perot micro-cavities were applied to measure the refractive index of optical glasses [8], or to realize wide-range displacement sensors with sub-nanometer resolution for Confocal Laser Microscopy [9].…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber Extrinsic Micro-Cavity Scanning Microscopy

Donato¹,

Morini²,

Farina³

2013

PIER

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Abstract-An extrinsic Fabry-Perot cavity in optical fiber is used to achieve surface imaging at infrared wavelengths. The micro-cavity is realized by approaching a single mode fiber with a numerical aperture NA to a sample and it is fed by a low-coherence source. The measurement of the reflected optical intensity provides a map of the sample reflectivity, whereas from the analysis of the reflected spectrum in the time/spatial domain, we disentangle the topography and contrast phase information, in the limit of nearly homogeneous sample with complex permittivity having Im(ε) Real(ε). The transverse resolution is not defined by the numerical aperture NA of the fiber and consequently by the conventional Rayleigh limit (about 0.6λ/NA), but it is a function of the transverse field behavior of the electromagnetic field inside the micro-cavity. Differently, the resolution in the normal direction is limited mainly by the source bandwidth and demodulation algorithm. The system shows a compact and simple architecture. An analytical model for data interpretation is also introduced.

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Strong Dispersive Propagation of Terahertz Wave: Time‐Domain Self‐Consistent Modeling of Metallic Wall Losses

Gao

et al. 2020

Advcd Theory and Sims

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The dispersion characteristics of electromagnetic waves have led to a wide range of applications, such as pulse compression, superluminal propagation, wave tunneling effect, and electron–wave interaction. The near‐cutoff wave inside a guiding system is strong dispersive. When the wave frequency reaches the terahertz band, this strong dispersive property is extremely sensitive to the losses induced by the limited conductivity of the component. This phenomenon is traditionally investigated through perturbation of boundary conditions in the frequency domain, which does not deal well with broad‐spectrum signals. Two simple and efficient time‐domain schemes to study the strong dispersive propagation of terahertz waves are proposed. One is based on relatively concise principles, called the constant frequency method. The second is the recursive convolution method, which is suitable for dealing with a wave with wider spectrum range. The reliability of both approaches is verified by the comparison of the dispersion curves. Using the proposed methods, the pulse compression of terahertz wave inside a strong dispersive waveguide is verified in principle.

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Experimental and Theoretical Studies of a Broadband Superluminality in Fabry-Perot Interferometer

Cited by 10 publications

References 33 publications

A Low Energy Consumption DOA Estimation Approach for Conformal Array in Ultra-Wideband

A Low Energy Consumption DOA Estimation Approach for Conformal Array in Ultra-Wideband

Optical Fiber Extrinsic Micro-Cavity Scanning Microscopy

Strong Dispersive Propagation of Terahertz Wave: Time‐Domain Self‐Consistent Modeling of Metallic Wall Losses

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