Resonant thermoelectric nanophotonics

Mauser, Kelly W.; Kim, Seyoon; Mitrović, Slobodan; Fleischman, Dagny; Pala, Ragıp; Schwab, Keith; Atwater, Harry A.

doi:10.1038/nnano.2017.87

Cited by 89 publications

(71 citation statements)

References 48 publications

(45 reference statements)

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“…Recently, highly wavelength-dependent resonant TE nano-photodetectors [451] were fabricated, which control temperature gradients in nanoscale volumes using high light-confinement, showing non-band gaplimited, uncooled, filterless two-material spectrometer from visible to infrared region on one chip. Meanwhile, new applications of micro-TE devices should be explored in more promising areas which have potential to transfer other signals into heat change.…”

Section: Summary and Perspectivementioning

confidence: 99%

High Performance Thermoelectric Materials: Progress and Their Applications

Yang

Chen

Dargusch

et al. 2017

Advanced Energy Materials

632

434

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Thermoelectric (TE) materials have the capability of converting heat into electricity, which can improve fuel efficiency, as well as providing robust alternative energy supply in multiple applications by collecting wasted heat, and therefore, assisting in finding new energy solutions. In order to construct high performance TE devices, superior TE materials have to be targeted via various strategies. The development of high performance TE devices can broaden the market of TE application and eventually boost the enthusiasm of TE material research. This review focuses on major novel strategies to achieve high‐performance TE materials and their applications. Manipulating the carrier concentration and band structures of materials are effective in optimizing the electrical transport properties, while nanostructure engineering and defect engineering can greatly reduce the thermal conductivity approaching the amorphous limit. Currently, TE devices are utilized to generate power in remote missions, solar–thermal systems, implantable or/wearable devices, the automotive industry, and many other fields; they are also serving as temperature sensors and controllers or even gas sensors. The future tendency is to synergistically optimize and integrate all the effective factors to further improve the TE performance, so that highly efficient TE materials and devices can be more beneficial to daily lives.

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Section: Summary and Perspectivementioning

confidence: 99%

High Performance Thermoelectric Materials: Progress and Their Applications

Yang

Chen

Dargusch

et al. 2017

Advanced Energy Materials

632

434

View full text Add to dashboard Cite

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Section: Strategies To Enhance the Photothermoelectric Responsementioning

confidence: 99%

“…As feasible alternatives to noble metals, TIs exhibit surface plasmon in the UV and visible regions as well, which is attributed to the interband transition–induced nonequilibrium carriers and metallic surface state. Mauser et al combined these two properties together, and constructed a subwavelength thermoelectric p–n junction, which exhibits an intrinsic resonant absorption in the visible range. This thermoelectric junction is composed of periodic nanowire array, and each end is connected to a broad pad of the same material (Figure e).…”

Section: Strategies To Enhance the Photothermoelectric Responsementioning

confidence: 99%

Progress of Photodetectors Based on the Photothermoelectric Effect

et al. 2019

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the radiation emitted by the room-temperature object is mainly in the LWIR region, with the peak wavelength of about 10 µm. [1] Because of these two properties, photodetectors operating in the LWIR range are of significant importance for the heat-seeking technologies, such as all-weather surveillance, night vision, and missile guidance. To detect such lowenergy radiation by photon detectors, commonly used photosensitive materials are narrow-bandgap semiconductors (e.g., HgCdTe) and quantum wells (e.g., GaAs/ InGaAs). [2,3] For these photodetectors, the dark current at room temperature usually is large, and thus a cryogenic cooling unit is indispensable, which certainly increases the size and weight of photon detectors. Therefore, to miniaturize the volume and weight of LWIR detectors, the development of high-performance uncooled photodetectors is vital. Thermal detectors are well known for their ultra-broadband spectral response from UV to far-infrared and even to terahertz at room temperature. The excellent ability of terahertz radiation (0.1-1 mm) to penetrate through nonconducting materials renders it particularly attractive for applications in tomographic inspection. [4,5] Thermal detectors are based on the measurement of temperature-dependent properties, such as the resistance for bolometers, the temperature-difference-driven voltage for photothermoelectric (PTE) detectors, and the spontaneous polarization for pyroelectric (PE) detectors. The photoresponse in PE detectors depends on the variation of the spontaneous polarization vector with temperature; therefore, an external chopper is needed when measuring the power of continuous-wave (CW) radiation. For bolometers, an external bias is required, which introduces the extra 1/f noise. The typical temperature-sensitive materials in commercial bolometers are vanadium oxide (VO x ) or amorphous silicon. The main advantage of VO x lies in that its temperature coefficient of resistance is high (≈4% K −1 ) while the resistivity remains low, which is beneficial to reduce the noise level. [6] Detailed comparisons among different kinds of photodetectors are listed in Table 1.PTE detectors are based on the photothermal conversion and thermoelectric effect. As schematically shown in Figure 1, after absorbing the photons on one side of PTE detector, a temperature difference (ΔT) is built up, which drives the directed diffusion of charge carriers from the hot end to the cold end, establishing an electric potential difference (ΔU). This process High-performance uncooled photodetectors operating in the long-wavelength infrared and terahertz regimes are highly demanded in the military and civilian fields. Photothermoelectric (PTE) detectors, which combine photothermal and thermoelectric conversion processes, can realize ultra-broadband photodetection without the requirement of a cooling unit and external bias. In the last few decades, the responsivity and speed of PTE-based photodetectors have made impressive progress with the discovery of novel thermoelectric materials and ...

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“…Plasmonic nanostructures with resonant excitations allow the extreme confinement of incident light within nanoscale space to form an enhanced electromagnetic (EM) field. Such nanostructures possess the spectrally selective absorption and can thus be used to realize various enhanced optical processes, including nonlinear optics, surface‐enhanced Raman scattering (SERS), and photoelectric conversion . Among them, the metallic gap‐structure has attracted wide attention because it can provide an extremely strongly coupled EM field within a sub‐nanometer gap .…”

Section: Introductionmentioning

confidence: 99%

Dual‐Electromagnetic Field Enhancements through Suspended Metal/Dielectric/Metal Nanostructures and Plastic Phthalates Detection in Child Urine

et al. 2019

Advanced Optical Materials

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Plasmonic nanostructures exhibit intriguing optical properties due to spectrally selective plasmon resonance and thus have broad applications, including biochemical sensing and photoelectric detections. However, excited plasmons are often strongly influenced by the substrates supporting the metallic nanostructures, which not only weakens the intrinsic plasmon coupling effect, but also results in a great reduction of optical near‐field enhancement. Here, a plasmonic nanostructure combining collapsible Au‐nanofingers with selective‐etching that enables Au to be suspended is demonstrated, thus avoiding the undesirable influence of the substrates on the local near‐field distribution and forming symmetric electromagnetic‐field enhancements at both the top and bottom surfaces. The polymer support of the Au‐nanofingers is selectively etched by oxygen plasma, while the Au‐cap retains its original size. After an ultrathin dielectric coating is applied on the Au‐nanofingers, suspended Au‐caps with extremely small dielectric gaps are formed via the collapse of neighboring Au‐nanofingers by exposing them to ethanol. These nanostructures can provide a surface‐enhanced Raman scattering (SERS) enhancement of up to ≈109, which is nearly twice that in the nonsuspended system. As a highly active SERS substrate, the label‐free detection of low‐concentration harmful plastic phthalates in a child's urine without any pretreatment is successfully demonstrated, which suggests that this method is suitable for medical prediagnosis.

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Resonant thermoelectric nanophotonics

Cited by 89 publications

References 48 publications

High Performance Thermoelectric Materials: Progress and Their Applications

High Performance Thermoelectric Materials: Progress and Their Applications

Progress of Photodetectors Based on the Photothermoelectric Effect

Dual‐Electromagnetic Field Enhancements through Suspended Metal/Dielectric/Metal Nanostructures and Plastic Phthalates Detection in Child Urine

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