Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

Ghanekar, Alok; Wang, Jiahui; Guo, Cheng; Fan, Shanhui; Povinelli, Michelle L.

doi:10.1021/acsphotonics.2c01411

Cited by 18 publications

(3 citation statements)

References 39 publications

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“…Future explorations (Fig. 3) might be expected on the microscale and in other physical domains like thermal radiation [90][91][92][93] and mass diffusion. [94][95][96][97] More potential applications are available, from wearable interactive thermal devices enhancing personal comfort to advanced medical treatments via blood flow regulation.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal diffusion metamaterials: Theories and applications

Liu,

Xu,

Huang

2024

Applied Physics Letters

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Diffusion metamaterials with artificial spatial structures have significant potential in controlling energy and mass transfer. Those static structures may lead to functionality and tunability constraints, impeding the application scope of diffusion metamaterials. Dynamic structures, adding the temporal dimension, have recently provided a new possibility for electric charge and heat diffusion regulation. This perspective introduces the fundamental theories and practical constructions of spatiotemporal diffusion metamaterials for achieving nonreciprocal, topological, or tunable properties. Compared with traditional static design, spatiotemporal modulation is promising to manipulate diffusion processes dynamically, with applications of real-time thermal coding and programming. Existing spatiotemporal diffusion explorations are primarily at macroscopic systems, and we may envision extending these results to microscale and other physical domains like thermal radiation and mass diffusion shortly.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal diffusion metamaterials: Theories and applications

Liu,

Xu,

Huang

2024

Applied Physics Letters

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“…An unfortunate drawback of all these designs, however, is the requirement of an external magnetic field which can severely limit their realistic application, since magnets are bulky, expensive, and lossy. Finally, an alternative theoretical approach to achieve nonreciprocal thermal emission has been proposed based on modulating in time the graphene's conductivity [18,19], which consists another way to break reciprocity by applying external bias [20]. While it is an interesting idea, the rapid time-modulation of graphene properties is very challenging to be achieved experimentally.…”

Section: Introductionmentioning

confidence: 99%

Broadband and wide angle nonreciprocal thermal emission from Weyl semimetal structures

Butler¹,

Argyropoulos²

2023

J. Opt. Soc. Am. B

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Nonreciprocal thermal emission is a cutting-edge technology that enables fundamental control over thermal radiation and has exciting applications in thermal energy harvesting. However, thus far one of the foremost challenges is making nonreciprocal emission operate over a broad wavelength range and for multiple angles. In this work, we solve this outstanding problem by proposing three different types of structures that always utilize only one Weyl semimetal (WSM) thin film combined with one or two additional dielectric or metallic layers and terminated by a metallic substrate. First, a tradeoff relationship between the magnitude and bandwidth of the thermal nonreciprocity contrast is established based on the thickness of the WSM film. Then, the bandwidth broadening effect is demonstrated via the insertion of a dielectric spacer layer that can also be fine-tuned by varying its thickness. Finally, further control on the resulting strong nonreciprocal thermal radiation is demonstrated by the addition of a thin metallic layer in the proposed few layer designs. The presented composite structures work for a broad frequency range and for multiple emission angles, resulting in highly advantageous properties for various nonreciprocal thermal radiation applications. Moreover, the proposed designs do not require any patterning and can be experimentally realized by simple deposition fabrication methods. They are expected to aid in the creation of broadband nonreciprocal thermal emitters that can find applications in new energy harvesting devices.

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“…It is worth noting that the hidden plexcitons P± at high temperatures will gradually reappear as the temperature drops, inducing a temperature-controlled switch for nonreciprocal transmission. Recently, the room-temperature plexcitons and nonreciprocal thermal photonics in metamaterial systems have attracted a lot of attention. , However, the conventional nonreciprocal/plexcitonic systems are still subject to special materials, structural dimensions, tuning accuracy, and strict experimental environments, − making it hard to achieve the nonreciprocal transmission of light–matter polaritons. Utilizing the temperature-dependent exciton energy and damping of monolayer WSe 2 , we achieve the accuracy control of nonreciprocal transmission efficiency by precisely tuning the environment temperature.…”

mentioning

confidence: 99%

Triple Plexcitonic Nonreciprocity of Magnetochiral Plexcitons

He,

Liang,

Deng

et al. 2024

Nano Lett.

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Nonreciprocal quantum devices, allowing different transmission efficiencies of light−matter polaritons along opposite directions, are key technologies for modern photonics, yet their miniaturization and fine manipulation remain an open challenge.Here, we report on magnetochiral plexcitons dressed with geometrictime double asymmetry in compact nonreciprocal hybrid metamaterials, leading to triple plexcitonic nonreciprocity with flexible controllability. A general magnetically dressed plexcitonic Born− Kuhn model is developed to reveal the hybrid optical nature and dynamic energy evolution of magnetochiral plexcitons, demonstrating a plexcitonic nonreciprocal mechanism originating from the strong coupling among photon, electron, and spin degrees of freedom. Moreover, we introduce the temperature-controlled knob/ switch for magnetochiral plexcitons, achieving precise magnetochiral control and nonreciprocal transmission in a given system. We expect this mechanism and approach to open up a new route for the integration and fine control of on-chip nonreciprocal quantum devices.

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Nonreciprocal Thermal Emission Using Spatiotemporal Modulation of Graphene

Cited by 18 publications

References 39 publications

Spatiotemporal diffusion metamaterials: Theories and applications

Spatiotemporal diffusion metamaterials: Theories and applications

Broadband and wide angle nonreciprocal thermal emission from Weyl semimetal structures

Triple Plexcitonic Nonreciprocity of Magnetochiral Plexcitons

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