Related Experiment Video
Updated: Jun 18, 2025
11:08
Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
Published on: November 30, 2012
18.9K
Bloch-surface-wave resonance in a cavity resonator for focusing retroreflection
Optics Letters
|August 2, 2024
Summary
This study presents a novel Bloch surface wave (BSW) retroreflector for compact lasers. The BSW design offers improved retro-reflectance compared to guided-mode resonance (GMR) structures.
Area of Science:
- Optics and Photonics
- Laser Technology
- Metamaterials
Background:
- Wavelength-selective retroreflectors are crucial for stabilizing semiconductor lasers.
- Existing guided-mode resonance (GMR) structures have limitations in retro-reflectance.
Purpose of the Study:
- To theoretically investigate a Bloch surface wave (BSW) resonance-based retroreflector.
- To enhance retro-reflectance for diverging waves in compact laser systems.
Main Methods:
- Design of a retroreflector with specific aperture and focal length for 1550 nm operation.
- Theoretical investigation and numerical simulation of BSW resonance.
- Comparison of BSW retro-reflectance with GMR-based structures.
Main Results:
- The designed BSW retroreflector demonstrated significantly improved retro-reflectance.
- Numerical simulations predicted a 11% increase in maximum retro-reflectance compared to GMR.
- The structure utilizes a focusing grating coupler and cavity resonator.
Conclusions:
- Bloch surface wave resonance offers a promising approach for high-performance retroreflectors.
- The developed BSW retroreflector is suitable for compact, wavelength-stabilized semiconductor lasers.
- This technology enhances external mirror performance for laser applications.
Related Concept Videos
01:28Standing Waves in a Cavity
897
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
897
01:07Reflection of Waves
3.7K
When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...
3.7K
01:14Sound Waves: Resonance
2.6K
Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
2.6K
01:07Propagation of Waves
2.3K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K
01:23Parallel Resonance
199
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
199
01:04Modes of Standing Waves: II
844
The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
844