Related Experiment Video
Updated: Mar 8, 2026
09:23
Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
15.1K
Subcycle Optical Response Caused by a Terahertz Dressed State with Phase-Locked Wave Functions
K Uchida1,2, T Otobe3, T Mochizuki4
1Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
Physical Review Letters
|January 14, 2017
Summary
Researchers observed modulated optical absorption in a GaAs quantum well using terahertz pulses. This reveals how photon-dressed electronic states influence light-matter interactions and optical responses.
Area of Science:
- Solid State Physics
- Quantum Optics
- Materials Science
Background:
- Light-matter interactions imprint phase information onto photon-dressed electronic states.
- Investigating the role of dressed states in optical response requires controlled electric fields and stable probe pulses.
Purpose of the Study:
- To investigate the role of photon-dressed electronic states in the optical response of a GaAs quantum well.
- To observe and analyze subcycle modulations in optical absorption.
Main Methods:
- Utilized a multicycle terahertz driving pulse and a near-infrared probe pulse.
- Measured optical absorption strengths in a GaAs quantum well.
- Compared experimental results with an analytical formula for optical susceptibilities.
Main Results:
- Observed optical absorption strengths modulated on a subcycle time scale.
- Experimental measurements closely matched the analytical formula.
- Confirmed the influence of dressed excitonic states on optical properties.
Conclusions:
- The study demonstrates coherent reshaping of probe intensity by excitonic sideband emissions.
- Confirms the significant role of photon-dressed electronic states in optical phenomena.
- Provides insights into controlling light-matter interactions in quantum well systems.
Related Concept Videos
01:21IR Absorption Frequency: Hybridization
1.5K
Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...
1.5K
01:25Deactivation Processes: Jablonski Diagram
2.0K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
2.0K
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.4K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
3.1K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
3.1K
01:12Double Resonance Techniques: Overview
829
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
Spin decoupling is usually achieved by...
829
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.7K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.7K