Reconfigurable behavior of CdTe quantum dots at terahertz frequencies employing UV excitation

Vazquez-Colon, Clarissa D.; Galvez, Juan Adrian Zepeda; Ayón, Arturo A.; Shreiber, David I.

doi:10.1109/dtip.2017.7984494

Cited by 1 publication

(1 citation statement)

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“…However, an all-optical reconfigurable device is highly desirable for THz communication and data transmission applications, and a dynamic reconfigurable performance could be achieved by modulating the dielectric characteristics of the media surrounding the metamaterial unit cell, for instance by the utilization of semiconducting quantum dots (QDs). Specifically, it has recently been reported that Cadmium Telluride (CdTe) QDs exhibit a variation in their dielectric characteristics when they are excited by an ultraviolet (UV) source [29]. However, their ability to modulate the response of a metamaterial array operating in the THz regime has not been demonstrated yet.…”

Section: Introductionmentioning

confidence: 99%

All-Optical Reconfigurable Metamaterial Employing the Self-Assembly of CdTe Quantum Dots

Zepeda-Galvez¹,

Shreiber²,

Ayón³

2020

OJINM

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Positively and negatively charged polyelectrolytes, namely, Poly(diallyldimethylammonium chloride) and Poly(styrene sulfonate), respectively, were employed to disperse and deploy negatively charged quantum dots on an otherwise passive metamaterial structure with a resonant frequency of 0.62 THz, by employing a layer-by-layer, self-assembly scheme. Upon exposure to a UV source with a wavelength of 365 nm the amplitude modulation was observed to increase with increases in the number of deposited bi-layers, until a modulation maximum of 2.68% was recorded enabling an all-optical, dynamically reconfigurable metamaterial geometry. Furthermore, amplitude modulation was subsequently observed to decrease with further increases in the number of layers employed due to quenching and shadowing effects. The experimental observations reported herein will enable the utilization of all-optical reconfigurable THz devices for communication and data transmission applications.

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Section: Introductionmentioning

confidence: 99%