Nano-thermoelectric infrared bolometers

Varpula, Aapo; Tappura, Kirsi; Tiira, Jonna; Grigoras, Kestutis; Kilpi, Olli Pekka; Sovanto, Kuura; Ahopelto, Jouni; Prunnila, Mika

doi:10.1063/5.0040534

Cited by 24 publications

(46 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We could envision similar applications for our device. Furthermore, one could also exploit our system in thermoelectric nanodevices similar to those designed in different platforms [72][73][74][75] carrying the advantage of higher operating temperatures. To conclude, we hope that the peculiar features of the bipolar thermoelectric effect here reported will spur further applications in the field of quantum technologies [29].…”

Section: Discussionmentioning

confidence: 99%

Bipolar Thermoelectricity in Bilayer-Graphene/Superconductor Tunnel Junctions

Bernazzani¹,

Marchegiani²,

Giazotto³

et al. 2022

Preprint

View full text Add to dashboard Cite

We investigate the thermoelectric properties of a hybrid nanodevice composed by a 2D carbonbased material and a superconductor. This system presents nonlinear bipolar thermoelectricity as induced by the spontaneous breaking of the Particle-Hole (PH) symmetry in a tunnel junction between a BiLayer Graphene (BLG) and a Bardeen-Cooper-Schrieffer (BCS) superconductor. In this scheme, the nonlinear thermoelectric effect, predicted and observed in SIS' junctions is not affected by the competitive effect of the Josephson coupling. From a fundamental perspective, the most intriguing feature of this effect is its bipolarity, that poses new issues on the nature of thermoelectricity in solid state systems. The capability to open and control the BLG gap guarantees improved thermoelectric performances, that reach up to 1 mV/K regarding the Seebeck coefficient and a power density of 1 nW/µm 2 for temperature gradients of tens of Kelvins. Furthermore, the externally controlled gating can also dope the BLG, which is otherwise intrinsically PH symmetric, giving us the opportunity to investigate the bipolar thermoelectricity even in presence of a controlled suppression of the PH symmetry. The predicted robustness of this system could foster further experimental investigations and applications in the near future, thanks to the available techniques of nano-fabrication.

show abstract

Section: Discussionmentioning

confidence: 99%

Bipolar Thermoelectricity in Bilayer-Graphene/Superconductor Tunnel Junctions

Bernazzani¹,

Marchegiani²,

Giazotto³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…One of the more critical applications is to measure the radiation energy of a series of light sources such as visible, [ 596 ] IR, and so on. [ 597 ] Where it is mounted on a rocket or high‐altitude balloon, the effects of the atmosphere could be avoided and astronomical observations were undertaken. [ 598 ] In electronics, it measures the output power of microwave sources.…”

Section: Applications Of Broadband Metamaterials Absorbersmentioning

confidence: 99%

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Wang

Duan

et al. 2023

Adv Funct Materials

111

View full text Add to dashboard Cite

Metamaterial absorbers have been widely studied and continuously concerned owing to their excellent resonance features of ultra-thin thickness, light-weight, and high absorbance. Their applications, however, are typically restricted by the intrinsic dispersion of materials and strong resonant features of patterned arrays (mainly referring to narrow absorption bandwidth). It is, therefore essential to reassert the principles of building broadband metamaterial absorbers (BMAs). Herein, the research progress of BMAs from principles, design strategies, tunable properties to functional applications are comprehensively and deeply summarized. Physical principles behind broadband absorption are briefly discussed, typical design strategies in realizing broadband absorption are further emphasized, such as top-down lithography, bottom-up self-assembly, and emerging 3D printing technology. Diversified active components choices, including optical response, temperature response, electrical response, magnetic response, mechanical response, and multi-parameter responses, are reviewed in achieving dynamically tuned broadband absorption. Following this, the achievements of various interdisciplinary applications for BMAs in energy-harvesting, photodetectors, radar-IR dual stealth, bolometers, noise absorbing, imaging, and fabric wearable are summarized. Finally, the challenges and perspectives for future development of BMAs are discussed.

show abstract

“…Traditional thermoelectrics rely on bulk material properties, whereas nano-thermoelectrics capitalize on improved material properties afforded by scaling down the thickness of thermoelectric materials to the sub-100nm regime. Within this regime the electro-thermal material properties can be enhanced, leading to improved photodetector performance that can narrow the gap between cooled and uncooled IR photodetector technologies 1,2 . IR photodetection is relevant for numerous applications such as thermal imaging for night vision, chemical analysis using infrared spectroscopy and remote temperature measurements [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

“…State-of-the-art (SoA) quantum IR detectors are widely used detector types, typically providing higher performance than thermal-type IR detectors in terms of speed and sensitivity 1,10 . However to obtain high sensitivity in the MWIR and LWIR range requires cooling from room temperature to cryogenic temperatures to reach maximum performance.…”

Section: Introductionmentioning

confidence: 99%

Uncooled nano-thermoelectric bolometers for infrared imaging and sensing

Varpula

Murros

Sovanto

et al. 2023

Optical Components and Materials XX

View full text Add to dashboard Cite

The state-of-the-art quantum infrared photodetectors have high performance, but obtaining high sensitivity in mid- and long-wavelength infrared (MWIR and LWIR) requires cooling and exotic materials. Whereas thermal detectors offer lower cost without the need for cooling but are typically slower and less sensitive than cooled quantum infrared detectors. Nanothermoelectrics and nanomembranes offer opportunities for enhancing the performance of uncooled MWIR and LWIR imaging and sensing. Similar to thermoelectric detectors, the infrared sensitive signal in those is generated by the thermoelectric effect, providing advantages over resistive bolometers, i.e. less noise sources and zero power consumption in the detector itself. We have recently demonstrated that nano-thermoelectrics provides a route towards high-sensitivity and cost-effective LWIR detection. When the thickness of the thermoelectric polysilicon membrane is reduced, increased phonon scattering leads to reduced thermal conductivity. This gives rise to the high thermoelectric figures of merit determining the detector sensitivity. The speed stems from the low-thermal-mass device design with an integrated metal nanomembrane absorber and the lack of separate support structures. We report integrated circuit concept for the readout of these detectors, and study how the absorber grid geometry determines the device performance. The fabricated devices have thermal time constants, responsivities and specific detectivities D* in the ranges of 190 – 208 μs, 334 – 494 V/W, and (7.9 – 8.7)·107 cmHz1/2/W, respectively. The differences in the device performance originate from the differences in the thermal mass, total resistance, and impedance matching of the absorber grid. By optimization, we expect that D* = 8.3·108 cmHz1/2/W can be reached.

show abstract

Nano-thermoelectric infrared bolometers

Cited by 24 publications

References 61 publications

Bipolar Thermoelectricity in Bilayer-Graphene/Superconductor Tunnel Junctions

Bipolar Thermoelectricity in Bilayer-Graphene/Superconductor Tunnel Junctions

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Uncooled nano-thermoelectric bolometers for infrared imaging and sensing

Contact Info

Product

Resources

About