Journal ArticleDOI
Switching between positive and negative permeability by photoconductive coupling for modulation of electromagnetic radiation
V.J. Logeeswaran,A.N. Stameroff,M. Saif Islam,Wei Wu,Alexander M. Bratkovsky,Phillip J. Kuekes,S.Y. Wang,R.S. Williams +7 more
TLDR
In this article, a photoconductive coupling mechanism for negative index materials (NIM) in the GHz frequency range was proposed by using split ring resonator (SRR) structure and simulated using a high frequency structure simulator (HFSSTM) program.Abstract:
We introduce a modulation mechanism for negative index materials (NIM) in the GHz frequency range by means of photoconductive coupling. This leads the way to a monolithically integrated modulable NIM achieved by conventional microfabrication techniques. The photosensitive material is deposited in the gap of the split ring resonator (SRR) structure and the response in terms of S-parameters is simulated using a high frequency structure simulator (HFSSTM) program. Only a single SRR particle is simulated to demonstrate total suppression of resonance amplitude and without any loss of generality the concept is applicable to a NIM comprising of both negative permeability and negative permittivity. This simple modulation of refractive indices can lead to novel optical device developments with the potential to dramatically improve the performance of existing phased array antennas, optical beam-forming networks, antenna remoting and transportation of RF power through fiber.read more
Citations
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Journal ArticleDOI
Electromagnetic Metamaterials: Transmission Line Theory and Microwave Applications. By Christophe Caloz and Tatsuo Itoh.
Journal ArticleDOI
A Perspective on Nanowire Photodetectors: Current Status, Future Challenges, and Opportunities
V. J. Logeeswaran,Jin-Yong Oh,Avinash P. Nayak,Aaron M. Katzenmeyer,Kristin H. Gilchrist,Sonia Grego,Nobuhiko P. Kobayashi,Shih-Yuan Wang,A. Alec Talin,Nibir K. Dhar,M. Saif Islam +10 more
TL;DR: In this paper, an ultrafast surface-illuminated photodetectors (PDs) with 114-ps full width at half-maximum (FWHM), edge-illuminated novel waveguide PDs, and some novel concepts of light trapping are discussed.
Patent
Actively tunable electromagnetic metamaterial
TL;DR: In this paper, the capacitively tuned split ring resonator is described as a structure having a gap and is formed of an electrically conductive material, and the photo-capacitive material is formed in close proximity to the structure such that the capacitance of the metamaterial is changed when illuminated by a selected range of wavelengths.
Journal ArticleDOI
Observation of genuine wave vector (k or β) gap in a dynamic transmission line and temporal photonic crystals
J. R. Reyes-Ayona,Peter Halevi +1 more
TL;DR: In this paper, a TPC is accurately mimicked by a dynamic transmission line (DTL) having a capacitance per unit length equal to e(t) (μ).
Journal ArticleDOI
Pulse propagation through a slab with time-periodic dielectric function ε(t).
TL;DR: It is proved that, for an incident quasi-monochromatic pulse, the transmitted pulse can be expressed as a superposition of partial pulses that are exact replicas of the incident pulse and that exit the slab with a time delay.
References
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Journal ArticleDOI
Negative Refraction Makes a Perfect Lens
TL;DR: The authors' simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver, which resolves objects only a few nanometers across.
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TL;DR: A composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability and permittivity varepsilon(eff)(omega).