Enhanced tunneling distance of near field radiative energy with high-index dielectric resonators

2021 ◽  
Vol 119 (23) ◽  
pp. 234101
Author(s):  
Sy-Bor Wen ◽  
Aravind Jakkinapalli
Keyword(s):  
Near Field ◽  
High Index ◽  
Radiative Energy ◽  
Dielectric Resonators ◽  
Tunneling Distance

One-Head Near-Field Writing/Erasing on a Rewritable Dual-Layer Optical Disk Having High-Index Cover and Separation Layers

2011 ◽  
Vol 50 (9S1) ◽  
pp. 09MG01 ◽  
Author(s):  
Kenji Narumi ◽  
Kazuya Hisada ◽  
Takashi Mihara ◽  
Haruhiko Habuta ◽  
Katsuhiko Hayashi ◽  
...  
Keyword(s):  
Near Field ◽  
Optical Disk ◽  
High Index ◽  
Separation Layers

Near Field Heat Transfer Between Metamaterials

2010 ◽  
Author(s):  
Philippe Ben-Abdallah ◽  
Karl Joulain ◽  
Je´re´mie Drevillon
Keyword(s):  
Heat Transfer ◽  
Negative Refraction ◽  
Near Field ◽  
Super Resolution ◽  
Electric Polarization ◽  
Radiative Energy ◽  
Correlation Lengths ◽  
Magnetic Resonances ◽  
Heat Transfers ◽  
Conversion Technologies

Composite materials structured at the scale of photon’s correlation lengths allow controlling the electromagnetic field they radiate in their surrounding both in far and near fields. Among these media, metamaterials are artificial magnetodielectric materials engineered to provide optical properties that we do not meet as it in nature. In some cases these materials enabled the manifestation of new phenomena such as the negative refraction, super-resolution, reversed Doppler effect and cloaking. In the present work, based on the fluctuational electrodynamics theory of Rytov, we study the non-radiative heat flux exchanged between two parallel metamaterials. We show that heat transfers between two metamaterials can be strongly affected by the presence of magnetic plasmons in the transverse electric polarization. The effect of relative position between the dielectric and magnetic resonances on heat transfer is discussed in details. Our results provide new perspectives for applications in radiative energy transfer and energy conversion technologies.

scholarly journals Near-field beam focusing by a single bare subwavelength metal slit with the high-index transmission space

2013 ◽  
Vol 21 (12) ◽  
pp. 13949 ◽  
Author(s):  
Yan Guo ◽  
Bo Zhao ◽  
Jianjun Yang
Keyword(s):  
Near Field ◽  
High Index ◽  
Beam Focusing

scholarly journals Subwavelength dielectric resonators for nonlinear nanophotonics

Science ◽  
2020 ◽  
Vol 367 (6475) ◽  
pp. 288-292 ◽  
Author(s):  
Kirill Koshelev ◽  
Sergey Kruk ◽  
Elizaveta Melik-Gaykazyan ◽  
Jae-Hyuck Choi ◽  
Andrey Bogdanov ◽  
...  
Keyword(s):  
Bound States ◽  
Second Harmonic ◽  
Nonlinear Effects ◽  
Dielectric Materials ◽  
High Index ◽  
Dielectric Resonators ◽  
Quality Factors ◽  
Second Harmonic Generation Efficiency ◽  
Radiative Losses ◽  
Nanoscale Lasers

Subwavelength optical resonators made of high-index dielectric materials provide efficient ways to manipulate light at the nanoscale through mode interferences and enhancement of both electric and magnetic fields. Such Mie-resonant dielectric structures have low absorption, and their functionalities are limited predominantly by radiative losses. We implement a new physical mechanism for suppressing radiative losses of individual nanoscale resonators to engineer special modes with high quality factors: optical bound states in the continuum (BICs). We demonstrate that an individual subwavelength dielectric resonator hosting a BIC mode can boost nonlinear effects increasing second-harmonic generation efficiency. Our work suggests a route to use subwavelength high-index dielectric resonators for a strong enhancement of light–matter interactions with applications to nonlinear optics, nanoscale lasers, quantum photonics, and sensors.

scholarly journals Enhancing radiative energy transfer through thermal extraction

Nanophotonics ◽  
2016 ◽  
Vol 5 (1) ◽  
pp. 22-30 ◽  
Author(s):  
Yixuan Tan ◽  
Baoan Liu ◽  
Sheng Shen ◽  
Zongfu Yu
Keyword(s):  
Thermal Radiation ◽  
Radiative Heat ◽  
Near Field ◽  
Light Output ◽  
Radiative Energy ◽  
Field Energy ◽  
Far Field ◽  
Thermal Extraction ◽  
Field Radiation ◽  
Boltzmann Law

Abstract Thermal radiation plays an increasingly important role in many emerging energy technologies, such as thermophotovoltaics, passive radiative cooling and wearable cooling clothes [1]. One of the fundamental constraints in thermal radiation is the Stefan-Boltzmann law, which limits the maximum power of far-field radiation to P0 = σT4S, where σ is the Boltzmann constant, S and T are the area and the temperature of the emitter, respectively (Fig. 1a). In order to overcome this limit, it has been shown that near-field radiations could have an energy density that is orders of magnitude greater than the Stefan-Boltzmann law [2-7]. Unfortunately, such near-field radiation transfer is spatially confined and cannot carry radiative heat to the far field. Recently, a new concept of thermal extraction was proposed [8] to enhance far-field thermal emission, which, conceptually, operates on a principle similar to oil immersion lenses and light extraction in light-emitting diodes using solid immersion lens to increase light output [62].Thermal extraction allows a blackbody to radiate more energy to the far field than the apparent limit of the Stefan-Boltzmann law without breaking the second law of thermodynamics.Thermal extraction works by using a specially designed thermal extractor to convert and guide the near-field energy to the far field, as shown in Fig. 1b. The same blackbody as shown in Fig. 1a is placed closely below the thermal extractor with a spacing smaller than the thermal wavelength. The near-field coupling transfers radiative energy with a density greater than σT4. The thermal extractor, made from transparent and high-index or structured materials, does not emit or absorb any radiation. It transforms the near-field energy and sends it toward the far field. As a result, the total amount of far-field radiative heat dissipated by the same blackbody is greatly enhanced above SσT4, where S is the area of the emitter. This paper will review the progress in thermal extraction. It is organized as follows. In Section 1, we will discuss the theory of thermal extraction [8]. In Section 2, we review an experimental implementation based on natural materials as the thermal extractor [8]. Lastly, in Section 3, we review the experiment that uses structured metamaterials as thermal extractors to enhance optical density of states and far-field emission [9].

Casimir Friction and Near-field Radiative Heat Transfer in Graphene Structures

2017 ◽  
Vol 72 (2) ◽  
pp. 171-180 ◽  
Author(s):  
A.I. Volokitin
Keyword(s):  
Heat Transfer ◽  
Energy Transfer ◽  
Transfer Coefficient ◽  
Graphene Sheet ◽  
Drift Velocity ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Near Field ◽  
Radiative Energy ◽  
Phonon Polaritons

AbstractThe dependence of the Casimir friction force between a graphene sheet and a (amorphous) SiO2 substrate on the drift velocity of the electrons in the graphene sheet is studied. It is shown that the Casimir friction is strongly enhanced for the drift velocity above the threshold velocity when the friction is determined by the resonant excitation of the surface phonon–polaritons in the SiO2 substrate and the electron–hole pairs in graphene. The theory agrees well with the experimental data for the current–voltage dependence for unsuspended graphene on the SiO2 substrate. The theories of the Casimir friction and the near-field radiative energy transfer are used to study the heat generation and dissipation in graphene due to the interaction with phonon–polaritons in the (amorphous) SiO2 substrate and acoustic phonons in graphene. For suspended graphene, the energy transfer coefficient at nanoscale gap is ~ three orders of magnitude larger than the radiative heat transfer coefficient of the blackbody radiation limit.

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