Valanju, Walser, and Valanju Reply:

Valanju, P.; Walser, R. M.; Valanju, A. P.

doi:10.1103/physrevlett.90.029704

Cited by 89 publications

(135 citation statements)

References 3 publications

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“…(5,7,8) prove the statement. One can see that the criterion which distinguishes between LHM and RM is independent of the sign of n.…”

Section: Theoremmentioning

confidence: 64%

“…Smith and Kroll (SK) argued [5] that in the LHM the refractive index should be negative while the group velocity (GV) is positive. This point of view is widely spread now [6,7,8,9,10]. Based upon this statement Valanju et al [7] challenged the Veselago's results and claimed that the refraction on the RM-LHM interface is positive.…”

Section: Introductionmentioning

confidence: 90%

“…(9) with non-traditional negative n. The most important mistake of Valanju et al [7] is of the same origin.…”

Section: Theoremmentioning

confidence: 99%

“…From Eqs. (7,8) follows that the negative sign of the GV and the Veselago results, including the negative refraction at the RM-LHM interface, are independent of the sign of n.…”

Section: Theoremmentioning

confidence: 99%

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Sign of refractive index and group velocity in left-handed media

Pokrovsky

Efros

2002

Solid State Communications

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We argue that the widely spread opinion that the left-handed media (LHM) are characterized by a negative refractive index n − is misleading. Since n does not enter into Maxwell's equations and boundary conditions, any medium may be described by both positive n and negative n − = −n.Two thermodynamic inequalities are presented, that make a difference between the LHM and the regular media (RM). The first one reads that the group velocity is positive in the RM and negative in the LHM. The second one is that the product Re(n)Im(n) is positive in the RM and negative in the LHM. Both inequalities are invariant with respect to the change n → n − . However, to use n − one should change some traditional electrodynamics definitions.

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“…(5,7,8) prove the statement. One can see that the criterion which distinguishes between LHM and RM is independent of the sign of n.…”

Section: Theoremmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 90%

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Sign of refractive index and group velocity in left-handed media

Pokrovsky

Efros

2002

Solid State Communications

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“…Ziolkowski [29] studied wave propagation in DNG medium both analytically and numerically. Valanju et al [30] found positive and very inhomogeneous wave refraction in this unusual medium. Ramakrishna [31] examined the problem of designing such materials which have negative material parameters.…”

Section: Introductionmentioning

confidence: 99%

Hot plasma waves surrounding the Schwarzschild event horizon in a Veselago medium

Sharif

Mukhtar

2011

Astrophys Space Sci

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This paper investigates wave properties of hot plasma in a Veselago medium. For the Schwarzschild black hole, the 3 + 1 GRMHD equations are re-formulated which are linearly perturbed and then Fourier analyzed for rotating (non-magnetized and magnetized) plasmas. The graphs of wave vector, refractive index and change in refractive are used to discuss the wave properties. The results obtained confirm the presence of Veselago medium for both rotating (non-magnetized and magnetized) plasmas. This work generalized the isothermal plasma waves in the Veselago medium to hot plasma case.

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Metamaterials for Enhanced Optical Responses and their Application to Active Control of Terahertz Waves

et al. 2020

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Metamaterials, artificially constructed structures that mimic lattices in natural materials, have made numerous contributions to the development of unconventional optical devices. With an increasing demand for more diverse functionalities, terahertz (THz) metamaterials are also expanding their domain, from the realm of mere passive devices to the broader area where functionalized active THz devices are particularly required. A brief review on THz metamaterials is given with a focus on research conducted in the authors' group. The first part is centered on enhanced THz optical responses from tightly coupled meta‐atom structures, such as high refractive index, enhanced optical activity, anomalous wavelength scaling, large phase retardation, and nondispersive polarization rotation. Next, electrically gated graphene metamaterials are reviewed with an emphasis on the functionalization of enhanced THz optical responses. Finally, the linear frequency conversion of THz waves in a rapidly time‐variant THz metamaterial is briefly discussed in the more general context of spatiotemporal control of light.

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Valanju, Walser, and Valanju Reply:

Cited by 89 publications

References 3 publications

Sign of refractive index and group velocity in left-handed media

Sign of refractive index and group velocity in left-handed media

Hot plasma waves surrounding the Schwarzschild event horizon in a Veselago medium

Metamaterials for Enhanced Optical Responses and their Application to Active Control of Terahertz Waves

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