Tunable daytime passive radiative cooling based on a broadband angle selective low-pass filter

Pech-May, Nelson W.; Retsch, Markus

doi:10.1039/c9na00557a

Cited by 16 publications

(4 citation statements)

References 28 publications

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“…The structures fabricated here, however, do absorb at least partially in the solar range, for example, because of higher-order modes of the magnetic polaritons (see Figure S9 in the Supporting Information). Consequently, additional optical elements such as selective solar reflectors and IR transmitters are needed for an application as a passive daytime cooler. − Nevertheless, such MDM structures are good candidates for nocturnal radiative cooling. Finally, because of the fact that MP resonances depend very weakly on the period, , large surfaces with similar optical absorptance characteristics compared to those presented in this work can be produced using colloidal lithography with micron-sized particle templates.…”

Section: Resultsmentioning

confidence: 99%

Design of Multimodal Absorption in the Mid-IR: A Metal Dielectric Metal Approach

Pech-May

Lauster

Retsch

2021

ACS Appl. Mater. Interfaces

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Specific control on the mid-infrared (mid-IR) emission properties is attracting increasing attention for thermal camouflage and passive cooling applications. Metal–dielectric–metal (MDM) structures are well known to support strong magnetic polariton resonances in the optical and near-infrared range. We extend the current understanding of such an MDM structure by specifically designing Au disc arrays on top of ZnS–Au–Si substrates and pushing their resonances to the mid-IR regime. Therefore, we combine fabrication via lift-off photolithography with the finite element method and an inductance–capacitance model. With this combination of techniques, we demonstrate that the magnetic polariton resonance of the first order strongly depends on the individual disc diameter. Furthermore, the fabrication of multiple discs within one unit cell allows a linear combination of the fundamental resonances to conceive broadband absorptance. Quite importantly, even in mixed resonator cases, the absorptance spectra can be fully described by a superposition of the individual disc properties. Our contribution provides rational guidance to deterministically design mid-IR emitting materials with specific narrow- or broadband properties.

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Section: Resultsmentioning

confidence: 99%

Design of Multimodal Absorption in the Mid-IR: A Metal Dielectric Metal Approach

Pech-May

Lauster

Retsch

2021

ACS Appl. Mater. Interfaces

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“…The systems need to maximize their emissivity in the atmosphere window for cooling when the temperature is above a critical value, but minimize emissivity in the entire thermal wavelength for heating when the temperature is below a critical value. Currently, some self-adaptive radiative cooling systems have been reported, which exist in various types 175 : modulating cooling and heating by temperature [176][177][178][179][180][181][182][183][184][185][186][187][188][189][190][191][192] , humidy 74,136,193 , mechanical [194][195][196][197][198][199][200] , and electrical 201 responds. This section introduces temperature based phase change material of vanadium dioxide (VO 2 ) [187][188][189][190][191][192] and electrical 201 respond.…”

Section: Tunable Functionalitymentioning

confidence: 99%

Photonic structures in radiative cooling

Lee,

Kim,

Jung

et al. 2023

Light Sci Appl

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Radiative cooling is a passive cooling technology without any energy consumption, compared to conventional cooling technologies that require power sources and dump waste heat into the surroundings. For decades, many radiative cooling studies have been introduced but its applications are mostly restricted to nighttime use only. Recently, the emergence of photonic technologies to achieves daytime radiative cooling overcome the performance limitations. For example, broadband and selective emissions in mid-IR and high reflectance in the solar spectral range have already been demonstrated. This review article discusses the fundamentals of thermodynamic heat transfer that motivates radiative cooling. Several photonic structures such as multilayer, periodical, random; derived from nature, and associated design procedures were thoroughly discussed. Photonic integration with new functionality significantly enhances the efficiency of radiative cooling technologies such as colored, transparent, and switchable radiative cooling applications has been developed. The commercial applications such as reducing cooling loads in vehicles, increasing the power generation of solar cells, generating electricity, saving water, and personal thermal regulation are also summarized. Lastly, perspectives on radiative cooling and emerging issues with potential solution strategies are discussed.

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“…For instance, Pech-May and Retsch proposed an angle-selective solar filter to flexibly control the radiative cooling during daytime via turning the placement orientation of the solar filter. 18 Wang et al designed a compound metasurface consisting of silver cross-resonators supported by polymers with a large thermal expansion coefficient, theoretically predicting the adaptive switch between radiative cooling and solar heating. 19 Xia et al conceived a kind of V-shaped window shutter, where the opening angle can be adjusted by the temperature-driven shape memory springs, enabling a tunable cooling according to seasons and climates.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Therefore, endeavors have been made to allow the radiative cooling effect to switch between ON and OFF modes dynamically. For instance, Pech-May and Retsch proposed an angle-selective solar filter to flexibly control the radiative cooling during daytime via turning the placement orientation of the solar filter . Wang et al designed a compound metasurface consisting of silver cross-resonators supported by polymers with a large thermal expansion coefficient, theoretically predicting the adaptive switch between radiative cooling and solar heating .…”

Section: Introductionmentioning

confidence: 99%

Passive and Dynamic Phase-Change-Based Radiative Cooling in Outdoor Weather

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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Radiative cooling has attracted considerable attention due to its tremendous potential in exploiting the cold reservoir of deep sky. However, overcooling always occurs in the conventional static radiative coolers because they operate only in the cooling mode in both hot and cold. Therefore, a dynamic radiative cooler based on phase change materials is highly desired. Nevertheless, the practical outdoor phase-change-based dynamic radiative cooling has not yet been experimentally demonstrated. To satisfy the stringent requirement of the phase-change-based radiative cooler in outdoor weather conditions, we engineered the phase-change material (VO 2 ) to possess the room-temperature phase-transition capability for typical weather conditions. Second, the reconfigurable cavity consists of the lossless spacer to ensure the magnitude of thermal modulation and suppress the solar absorption simultaneously. Third, the practical selective-filtering method is devised to shield the solar irradiance while permitting the thermal emission. Our experiment demonstrates that these materials and photonic measures can work together to realize the dynamic radiative cooling in actual weather conditions, which shows a self-adaptive switch between the ON-cooling state in hot daytime and the OFF-cooling state in cold nighttime. The study pushes the radiative cooler toward multifunctionality and provides beneficial guidance for the phase-change-based intelligent thermal control.

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Tunable daytime passive radiative cooling based on a broadband angle selective low-pass filter

Abstract: Dynamic control for passive radiative cooling during daytime.

Cited by 16 publications

References 28 publications

Design of Multimodal Absorption in the Mid-IR: A Metal Dielectric Metal Approach

Design of Multimodal Absorption in the Mid-IR: A Metal Dielectric Metal Approach

Photonic structures in radiative cooling

Passive and Dynamic Phase-Change-Based Radiative Cooling in Outdoor Weather

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