Related Experiment Video
Updated: Jun 5, 2025
09:33
Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
6.2K
Temperature invariant metasurfaces.
Shany Zrihan Cohen1,2, Danveer Singh1,2, Sukanta Nandi1,2
1Faculty of Engineering, Bar-Ilan University, Ramat-Gan 5290002, Israel.
Nanophotonics (Berlin, Germany)
|December 5, 2024
Summary
Researchers developed temperature-invariant nanophotonic devices using hybrid resonators. This approach compensates for thermal effects, ensuring stable optical performance across various temperatures and spectral bands.
Area of Science:
- Nanophotonics
- Materials Science
- Optoelectronics
Background:
- Thermal effects significantly impact material properties, influencing optoelectronic devices.
- The thermo-optic (TO) effect, a change in refractive index with temperature (dn/dT), enables tunable optical devices but causes instability in static applications.
- Undesirable drifts in resonance, amplitude, and phase occur due to temperature variations.
Purpose of the Study:
- To present a systematic method for mitigating thermally induced optical fluctuations in nanophotonic devices.
- To engineer nanophotonic components with a zero effective TO coefficient (dneff/dT ≈ 0).
- To achieve temperature-invariant performance in meta-atoms and metasurfaces.
Main Methods:
- Utilizing hybrid subwavelength resonators made from two materials with opposing TO dispersions (dn/dT < 0 and dn/dT > 0).
- Compensating for TO shifts by carefully selecting materials with opposite thermal sensitivities.
- Demonstrating the effectiveness of the approach across a wide temperature range and broad spectral band.
Main Results:
- Achieved zero effective TO coefficient (dneff/dT ≈ 0) in engineered nanophotonic components.
- Demonstrated temperature-invariant resonant frequency, amplitude, and phase response.
- Validated performance in meta-atoms and metasurfaces over a broad temperature range.
Conclusions:
- The proposed hybrid resonator approach effectively mitigates thermal effects in nanophotonics.
- This method enables the creation of stable, temperature-invariant optoelectronic devices.
- Controlling TO dispersion offers advanced light manipulation capabilities for nanophotonic systems.
More Related Videos
Related Concept Videos
01:05Absorption of Radiation
706
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
706
01:28Magnetostatic Boundary Conditions
874
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
874
01:11Temperature and Thermal Equilibrium
6.6K
Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
6.6K
01:27Gauss's Law: Planar Symmetry
7.8K
A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
7.8K
01:16Equipotential Surfaces and Conductors
3.3K
For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic...
3.3K
01:12Temperature Dependent Deformation
139
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
139