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Graphic depiction of the PRTPV concept.

Keunhan Park

Keunhan Park

University of Utah

This proposal seeks to develop a transformative energy system — the plasmon-enhanced radioisotope Thermophotovoltaic (PRTPV) generator — that significantly surpasses the performance of current radioisotope thermoelectric generators (RTGs) in both specific power and efficiency. Designed to achieve a specific power of 17 W/kg and a thermal-to-electric conversion efficiency greater than 40%, the PRTPV offers a sevenfold improvement in efficiency and nearly an order-of-magnitude increase in specific power compared to state-of-the-art RTGs. The system combines two novel innovations: the use of a high-refractive-index, low infrared loss, low-thermal-conductivity, and high-melting point material (e.g., Al2O3) to replace the traditional vacuum gap between the heat source and photovoltaic (PV) cell, enhancing thermal radiation power density proportional to the square of the refractive index, and the integration of a multilayered photonic crystal plasmon coupler to spectrally tune the thermal radiation by exciting surface plasmons at the coupler-PV cell interface matching with the PV cell’s bandgap, further improving conversion efficiency. Together, these advances overcome the low power density that limits current TPV systems. The resulting technology is compact, efficient, and scalable, opening the door to new classes of NASA missions, including long-duration surface operations in permanently shadowed lunar regions and interstellar missions where solar power is impractical. The proposed work directly supports NASA’s long-term goals in space exploration and energy innovation.

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Last Updated

Jul 21, 2026

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Loura Hall

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Street art is ubiquitous in Rotterdam, coming in all shapes and sizes, covering a vast array of topics in its own unique way. The canal vulva is one such piece that has fascinated passersby for over a decade.

Not much is known about this piece, apart from the fact that it is a female reproductive organ that was fastened to the wall close to some space invader mosaics. Locals call it 'Kutkunst' and believe that it's a feminist statement. They are generally quite fond of it, and have helped keep it free of vandalism for over a decade.