Survival probability time distribution in dielectric cavities.
Jung-Wan Ryu1, Soo-Young Lee, Chil-Min Kim
1National Creative Research Initiative Center for Controlling Optical Chaos, Pai-Chai University, Daejeon 302-735, Korea.
Summary
This study analyzes survival probability time distributions (SPTD) in dielectric cavities. SPTD behavior varies with cavity shape, showing algebraic or exponential decay influenced by factors like the Brewster angle and refractive index.
Area of Science:
- Physics
- Optics
- Cavity Quantum Electrodynamics
Background:
- Dielectric cavities are crucial for controlling light-matter interactions.
- Understanding the survival probability time distribution (SPTD) is key to analyzing particle behavior within these cavities.
Purpose of the Study:
- To investigate the SPTD in various dielectric cavity geometries.
- To determine how cavity shape and optical properties influence temporal decay patterns.
Main Methods:
- Theoretical analysis of SPTD in circular, stadium-shaped, and quadrupolar deformed dielectric cavities.
- Examination of TM and TE modes, considering phenomena like the Brewster angle.
Main Results:
- Circular cavities exhibit algebraic long-time SPTD (t^-2) with shape-dependent short-time behavior (exponential for TE due to Brewster angle).
- Stadium-shaped cavities show exponential SPTD decay, with the exponent related to the refractive index (gamma ~ n^-2).
- Quadrupolar cavities display either algebraic or exponential long-time SPTD, contingent on island location within the phase space.
Conclusions:
- Cavity geometry significantly dictates the long-term survival probability dynamics.
- The Brewster angle influences short-time SPTD in TE modes of circular cavities.
- Refractive index and phase space topology are critical parameters for SPTD in deformed cavities.
Related Concept Videos
Capacitor With A Dielectric
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
Dielectric Polarization in a Capacitor
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
Gauss's Law in Dielectrics
Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
Susceptibility, Permittivity and Dielectric Constant
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
Electrostatic Boundary Conditions in Dielectrics
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Standing Waves in a Cavity
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:


