scholarly journals Overcoming the black body limit in plasmonic and graphene near-field thermophotovoltaic systems

2012 ◽  
Vol 20 (S3) ◽  
pp. A366 ◽  
Author(s):  
Ognjen Ilic ◽  
Marinko Jablan ◽  
John D. Joannopoulos ◽  
Ivan Celanovic ◽  
Marin Soljačić
Keyword(s):  
Near Field ◽  
Black Body ◽  
Thermophotovoltaic Systems

scholarly journals Giant heat transfer in the crossover regime between conduction and radiation

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Konstantin Kloppstech ◽  
Nils Könne ◽  
Svend-Age Biehs ◽  
Alejandro W. Rodriguez ◽  
Ludwig Worbes ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Near Field ◽  
Black Body ◽  
Black Body Radiation ◽  
Quantitative Measurements ◽  
Atomic Spacing ◽  
Large Heat ◽  
Vacuum Gaps ◽  
Near Field Scanning

Abstract Heat is transferred by radiation between two well-separated bodies at temperatures of finite difference in vacuum. At large distances the heat transfer can be described by black body radiation, at shorter distances evanescent modes start to contribute, and at separations comparable to inter-atomic spacing the transition to heat conduction should take place. We report on quantitative measurements of the near-field mediated heat flux between a gold coated near-field scanning thermal microscope tip and a planar gold sample at nanometre distances of 0.2–7 nm. We find an extraordinary large heat flux which is more than five orders of magnitude larger than black body radiation and four orders of magnitude larger than the values predicted by conventional theory of fluctuational electrodynamics. Different theories of phonon tunnelling are not able to describe the observations in a satisfactory way. The findings demand modified or even new models of heat transfer across vacuum gaps at nanometre distances.

scholarly journals Mie-Metamaterials-Based Thermal Emitter for Near-Field Thermophotovoltaic Systems

Materials ◽  
2017 ◽  
Vol 10 (8) ◽  
pp. 885 ◽  
Author(s):  
Alok Ghanekar ◽  
Yanpei Tian ◽  
Sinong Zhang ◽  
Yali Cui ◽  
Yi Zheng
Keyword(s):  
Near Field ◽  
Thermal Emitter ◽  
Thermophotovoltaic Systems

Evaluation of performance of near-field thermophotovoltaic systems based on entropy analysis

2020 ◽  
Vol 127 (6) ◽  
pp. 063103
Author(s):  
Bowen Li ◽  
Qiang Cheng ◽  
Jinlin Song ◽  
Kun Zhou ◽  
Lu Lu ◽  
...  
Keyword(s):  
Near Field ◽  
Entropy Analysis ◽  
Evaluation Of Performance ◽  
Thermophotovoltaic Systems

3.3 μm high brightness LEDs

2005 ◽  
Vol 891 ◽  
Author(s):  
Boris A. Matveev ◽  
Nonna V. Zotova ◽  
Natalya Il'inskaya ◽  
Sergey A. Karandashev ◽  
Maxim A. Remennyi ◽  
...  
Keyword(s):  
Body Temperature ◽  
Output Power ◽  
Flip Chip ◽  
Near Field ◽  
Black Body ◽  
Surface Roughening ◽  
High Brightness ◽  
Power Enhancement ◽  
Power Measurements

ABSTRACTDeep mesa etching and surface roughening have been implemented to InAs flip-chip LEDs emitting at 3300 nm (300 K). Near field and power measurements confirmed the output power enhancement of about 2 and brightness increase with and equivalent to a black body temperature of about 1250 K.

Near Field Surface Wave Enhanced Photon Transport

2003 ◽  
Author(s):  
Arvind Narayanaswamy ◽  
Gang Chen
Keyword(s):  
Energy Transfer ◽  
Near Field ◽  
Black Body ◽  
Black Body Radiation ◽  
Radiative Energy ◽  
Radiative Energy Transfer ◽  
Fluctuation Dissipation ◽  
Polar Materials ◽  
Photovoltaic Material ◽  
Classical Radiation

Radiative energy transfer as described by the classical radiation transfer theory of Planck is valid only when the distance between the participating surfaces is larger than a few wavelengths of the characteristic radiation. When the spacing is comparable to the wavelength, electromagnetic theory and the fluctuation-dissipation theorem can be used to predict the energy transfer between the surfaces. We have used the electromagnetic Green’s function method to model the thermal energy transfer between two half planes with planar layers in between. With polar materials as the half planes, we see a narrowband energy transfer in the near field due to energy transfer by surface phonon polaritons. We have used this technique to show that such a resonance, however dampened, persists even with the presence of a layer of photovoltaic material. This results in not only an increased energy transfer to the photovoltaic material as compared to black body radiation but also imparts a narrowband characteristic to it. The implications for thermophotovoltaics are discussed.

scholarly journals Self-sustaining thermophotonic circuits

2019 ◽  
pp. 201904938
Author(s):  
Bo Zhao ◽  
Siddharth Buddhiraju ◽  
Parthiban Santhanam ◽  
Kaifeng Chen ◽  
Shanhui Fan
Keyword(s):  
Steady State ◽  
Power Density ◽  
Light Emitting Diodes ◽  
Near Field ◽  
State Power ◽  
Field Enhancement ◽  
Photon Flux ◽  
Light Emitting ◽  
General Importance ◽  
Thermophotovoltaic Systems

Photons represent one of the most important heat carriers. The ability to convert photon heat flow to electricity is therefore of substantial importance for renewable energy applications. However, photon-based systems that convert heat to electricity, including thermophotovoltaic systems where photons are generated from passive thermal emitters, have long been limited by low power density. This limitation persists even with near-field enhancement techniques. Thermophotonic systems, which utilize active photon emitters such as light-emitting diodes, have the potential to significantly further enhance the power density. However, this potential has not been realized in practice, due in part to the fundamental difficulty in thermodynamics of designing a self-sustaining circuit that enables steady-state power generation. Here, we overcome such difficulty by introducing a configuration where the light-emitting diodes are connected in series, and thus multiple photons can be generated from a single injected electron. As a result we propose a self-sustaining thermophotonic circuit where the steady-state power density can exceed thermophotovoltaic systems by many orders of magnitude. This work points to possibilities for constructing heat engines with light as the working medium. The flexibility of controlling the relations between electron and photon flux, as we show in our design, may also be of general importance for optoelectronics-based energy technology.

Near-field scanning optical microscopy

1986 ◽  
Vol 44 ◽  
pp. 642-643
Author(s):  
E. Betzig ◽  
A. Harootunian ◽  
M. Isaacson ◽  
A. Lewis
Keyword(s):  
Near Field ◽  
Optical Microscope ◽  
Visible Radiation ◽  
Field Methods ◽  
Optical Elements ◽  
Optical Region ◽  
Order Of Magnitude ◽  
Nondestructive Imaging ◽  
Scanning Optical Microscopy ◽  
Near Field Scanning

In general, conventional methods of optical imaging are limited in spatial resolution by either the wavelength of the radiation used or by the aberrations of the optical elements. This is true whether one uses a scanning probe or a fixed beam method. The reason for the wavelength limit of resolution is due to the far field methods of producing or detecting the radiation. If one resorts to restricting our probes to the near field optical region, then the possibility exists of obtaining spatial resolutions more than an order of magnitude smaller than the optical wavelength of the radiation used. In this paper, we will describe the principles underlying such "near field" imaging and present some preliminary results from a near field scanning optical microscope (NS0M) that uses visible radiation and is capable of resolutions comparable to an SEM. The advantage of such a technique is the possibility of completely nondestructive imaging in air at spatial resolutions of about 50nm.

Principles of Planar Near-Field Antenna Measurements

2007 ◽  
Author(s):  
Stuart Gregson ◽  
John McCormick ◽  
Clive Parini
Keyword(s):  
Near Field ◽  
Antenna Measurements
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