Study of Microcavity Polariton Superfluidity Through Resonant Rayleigh Scattering (CAT#: STEM-ST-0060-YJL)

Introduction

The concept of a quantum fluid has played a central role in many fields of condensed matter and atomic physics, ranging from superconductors to Helium fluids and, more recently, atomic Bose-Einstein condensates. One of the most exciting manifestations of macroscopic coherence is superfluidity, i.e., the possibility of frictionless flow.
Superfluidity of the polariton fluid manifests itself as a quenching of the RRS intensity when the flow velocity imprinted by the exciting laser is slower than the sound velocity in the polariton fluid. Furthermore, a dramatic reshaping of the RRS pattern due to polariton-polariton interactions can be observed in both momentum and real space even at higher flow velocities.

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Principle Applications Procedure Materials Notes Related Products

Principle

Resonance Rayleigh scattering (RRS) is similar to Rayleigh scattering in nature. Resonance Rayleigh scattering is a special elastic scattering produced when the wavelength of Rayleigh scattering (RS) is located at or close to its molecular absorption band. The key to generating RRS is: when the scattering is at or close to the absorption band of the scattering molecule, since the electron absorbs the electromagnetic wave at the same frequency as the scattering frequency, the electron strongly absorbs the photon energy due to resonance and re-scatters. Its scattering intensity is several orders of magnitude higher than that of pure Rayleigh scattering, and it no longer obeys the Rayleigh law of I∝λ-4. This absorption-rescattering process is called resonance Rayleigh scattering (RRS).

Applications

Resonance Rayleigh scattering is used to the study of aggregation of chromophores on biological macromolecules and the determination of biological macromolecules such as nucleic acid, proteins and heparin, further, it has been used in the determination of trace amounts of inorganic ions and the cationic surfactant by means of ion association reactions with some dyes. In addition, it has been applied to the study of nanoparticles in liquid and the determination of β-cyclodextrin inclusion constant and the critical micelle concentration of surfactant.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Rayleigh scattering measurement system

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