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pro vyhledávání: '"Lu, W T"'
Based on the Keldysh Green's function method, we report an unconventional two-parameter quantum pumping in graphene with a line defect. It is found that different from the conventional sinusoidal relation, the pumped current in this device is cosinus
Externí odkaz:
http://arxiv.org/abs/2111.11686
Autor:
Hung, J.-J., Wang, Y.-H., Fu, K.-H., Lee, I-H., Tsai, S.-S., Lee, C.-Y., Lu, W.-T., Shen, Y.-J., Lin, Y.-H.
Publikováno v:
In Progress in Oceanography December 2021 199
In the last decade, metamaterials-based superlenses, with a resolution below Abbe's diffraction limit, have emerged. To obtain a rough estimate of the resolution of such superlenses, imaging of two subwavelength slits, separated by a subwavelength ga
Externí odkaz:
http://arxiv.org/abs/1105.0182
Autor:
Lu, W. T., Sridhar, S.
The optical properties of slab waveguides made of indefinite permittivity ($\vep$) materials (IEM) are considered. In this medium the transverse permittivity is negative while the longitudinal permittivity is positive. At any given frequency the wave
Externí odkaz:
http://arxiv.org/abs/0902.4482
Autor:
Casse, B. D. F., Banyal, R., Lu, W. T., Huang, Y. J., Selvarasah, S., Dokmeci, M., Sridhar, S.
Publikováno v:
Appl. Phys. Lett. 92, 243122 (2008).
We show that a binary-staircase optical element can be engineered to exhibit an effective negative index of refraction, thereby expanding the range of optical properties theoretically available for future optoelectronic devices. The mechanism for ach
Externí odkaz:
http://arxiv.org/abs/0806.0615
Publikováno v:
Phys. Rev. A 77, 063836 (2008).
Exact solutions are obtained for all the modes of wave propagation along an anisotropic cylindrical waveguide. Closed-form expressions for the energy flow on the waveguide are also derived. For extremely anisotropic waveguide where the transverse per
Externí odkaz:
http://arxiv.org/abs/0804.4445
Autor:
Lu, W. T., Sridhar, S.
Publikováno v:
Phys. Rev. B 77, 233101 (2008)
We show that a metamaterial consisting of aligned metallic nanowires in a dielectric matrix has strongly anisotropic optical properties. For filling ratio f<1/2, the composite medium shows two surface plasmon resonances (SPRs): the transverse and lon
Externí odkaz:
http://arxiv.org/abs/0710.4933
Publikováno v:
Phys. Rev. A 76, 013824 (2007).
We show that with an appropriate surface modification, a slab of photonic crystal can be made to allow wave transmission within the band gap. Furthermore, negative refraction and all-angle-negative-refraction (AANR) can be achieved by this surface mo
Externí odkaz:
http://arxiv.org/abs/cond-mat/0703733
Publikováno v:
Optics Express 15, 9166-9175 (2007).
Refraction at a smooth interface is accompanied by momentum transfer normal to the interface. We show that corrugating an initially smooth, totally reflecting, non-metallic interface provides a momentum kick parallel to the surface, which can be used
Externí odkaz:
http://arxiv.org/abs/cond-mat/0702286
Publikováno v:
APPLIED PHYSICS LETTERS 89, 084104 (2006)
Negative refraction is demonstrated in one-dimensional (1D) dielectric photonic crystals (PCs) at microwave frequencies. Focusing by plano-concave lens made of 1D PC due to negative refraction is also demonstrated. The frequency-dependent negative re
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604283