scholarly journals Towards Heralded Two-Photon Absorption and Two-Photon Excited Fluorescence for Quantum Microscopy and Spectroscopy

2020 ◽  
Author(s):  
Andreas Jechow
Keyword(s):  
Single Photon ◽  
Entanglement Swapping ◽  
Fixed Number ◽  
Photon Absorption ◽  
Sum Frequency ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Potential Applications ◽  
Quantum Technology ◽  
Down Conversion

The interaction between single or a fixed number of photons with a single absorber is of fundamental interest in quantum technology. The harnessing of light matter interactions at the single particle limit has several potential applications ranging from quantum communication and quantum metrology to quantum imaging. In this letter, a setup for heralded two-photon absorption at the single absorber level is proposed. The setup is based on a heralded two-photon source utilizing spontaneous parametric down-conversion, entanglement swapping and sum frequency generation for joint detection. The feasibility of the scheme is discussed by reviewing recent achievements in utilizing entangled and correlated photons for two-photon absorption as well as single photon absorption experiments at the limit of single absorbers in the context of applications in imaging (here mainly microscopy) and spectroscopy.

OPTICAL NONLINEARITY VIA PHONONS AS AN INTERMEDIARY

2001 ◽  
Vol 10 (01) ◽  
pp. 65-77 ◽  
Author(s):  
OU FA ◽  
HE MINGGAO ◽  
WU FUGEN
Keyword(s):  
Second Harmonic ◽  
Optical Nonlinearity ◽  
Photon Absorption ◽  
Saturation Phenomenon ◽  
Sum Frequency ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Threshold Phenomenon ◽  
Anti Stokes ◽  
The Given

A new model to describe the origin of optical nonlinearity is presented. In this model, the interaction between light and medium is reduced to the coupling of photons with phonons, which occurs in the crystal lattice vibrating anharmonically. Then the optical nonlinearity originates from the nonlinear photon–phonon coupling or the interaction among phonons themselves. In this paper, more attention is drawn to the latter. By the given model, (1) degenerate and (2) nondegenerate parametric oscillations, (3) Stokes and (4) anti-Stokes Raman scattering, (5) sum-frequency and (6) second harmonic generation and (7) two-photon absorption are dealt with systematically and quantum-mechanically. The results of theoretical analysis show that the effects (1)–(4) are associated with threshold phenomenon, whereas the effects (5)–(7) with the saturation phenomenon.

scholarly journals Determination of 4H-SiC Ionization Rates Using OBIC Based on Two-Photon Absorption

2016 ◽  
Vol 858 ◽  
pp. 245-248 ◽  
Author(s):  
Hassan Hamad ◽  
Christophe Raynaud ◽  
Pascal Bevilacqua ◽  
Sigo Scharnholz ◽  
Bertrand Vergne ◽  
...  
Keyword(s):  
Single Photon ◽  
Green Laser ◽  
Photon Absorption ◽  
Absorption Process ◽  
Field Range ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Avalanche Diodes ◽  
Single Photon Absorption ◽  
Ionization Rates

Optical Beam Induced Current (OBIC) measurements are performed on 4H-SiC avalanche diodes with a very thin and a highly doped active region. A pulsed green laser, with a wavelength of 532 nm, illuminates a reverse biased diode leading to generate electron-hole pairs in the space charge region. Comparison between the 4H-SiC bandgap and the incident photon energy shows that single photon absorption process can be neglected and two-photon absorption process dominates in this case. Ionization rates are then extracted from multiplication curve in a high electric field range (3 to 5 MV.cm–1). Results are in good agreement with previous ones obtained on the same diodes using single photon absorption process.

A Novel Multibranched Chromophore Containing Carbazole Moiety for Two-Photon Microfabrication

2012 ◽  
Vol 485 ◽  
pp. 566-569
Author(s):  
Zhi Yuan Hu ◽  
Fu Quan Guo ◽  
Hao Liang ◽  
Bin Guo
Keyword(s):  
Cross Section ◽  
Laser Power ◽  
Photon Absorption ◽  
Structural Motif ◽  
Incident Laser ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Incident Laser Power ◽  
Potential Applications ◽  
Pentaerythritol Triacrylate

A novel multibranched chromophore containing carbazole moiety，4, 4´, 4´´-tris(9-carbazyl-trans-styryl) triphenylamine (TCSTPA)，was synthesized and characterized by 1HNMR and elemental analysis. A larger two-photon absorption (TPA) cross section of the chromophore was obtained as high as 2350 GM compared to that of the traditional linear chromophore when pumped by a femtosecond laser at 800 nm. Microstructure based on TPA induced polymerization with a spatial resolution of submicron was fabricated under much lower incident laser power using TCSTPA as a TPA photoinitiator and a multifunctional resin of pentaerythritol triacrylate (PETA) as a polymerizable monomer. The result indicates potential applications of this kind of chromophores with multibranched structural motif in the fabrication of polymer and functional microdevices.

Multiphoton Excitation Studies on GaN with PS Pulses

1996 ◽  
Vol 449 ◽  
Author(s):  
I. H. Libon ◽  
C. Voelkmann ◽  
D. Kim ◽  
V. Petrova-Koch ◽  
Y. R. Shen
Keyword(s):  
Excitation Spectrum ◽  
Photon Absorption ◽  
Multiphoton Excitation ◽  
Defect States ◽  
Sum Frequency ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Theoretical Predictions ◽  
Frequency Excitation ◽  
Two Photon Absorption Coefficient

ABSTRACTWe report the observation of UV photoluminescence (PL) from wurtzite GaN by multiphoton excitation. The dependence of the PL intensity on excitation intensity as well as PL excitation measurements with sub-bandgap photon energies indicate the existence of deep defect states centered at about 1.0 eV above the top of the valence band. This result was confirmed by a sum-frequency excitation spectrum. We correlate these measurements with the omnipresent yellow luminescence in GaN. Our two-photon PL excitation spectrum yields a two-photon absorption coefficient that agrees very well with theoretical predictions.

Transient and steady-state behavior of single and two-photon absorption by microwave driven field

2014 ◽  
Vol 92 (4) ◽  
pp. 284-288
Author(s):  
Seyyed Hossein Asadpour ◽  
H. Rahimpour Soleimani
Keyword(s):  
Steady State ◽  
Microwave Field ◽  
Single Photon ◽  
Photon Absorption ◽  
State Behavior ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Probe Gain ◽  
The One ◽  
Transient And Steady State

In this paper, the effect of microwave field on the transient and steady state response of the four-level inverted Y-type atomic system is investigated. It is found that the properties of transient and steady processes can be affected by microwave field. It is found that the absorption spectrum behaves differentially for single-photon absorption and two-photon absorption. Also it is observed that in the one-photon absorption, the microwave field can lead to the probe gain and for two-photon absorption case, the strong microwave can enhance the absorption.

scholarly journals How to optimize the absorption of two entangled photons

2021 ◽  
Vol 4 (4) ◽  
Author(s):  
Edoardo Carnio ◽  
Andreas Buchleitner ◽  
Frank Schlawin
Keyword(s):  
Pulse Shaping ◽  
Absorption Efficiency ◽  
Photon Absorption ◽  
Spatial Light Modulators ◽  
Schmidt Decomposition ◽  
Maximum Enhancement ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Light Modulators ◽  
Down Conversion

We investigate how entanglement can enhance two-photon absorption in a three-level system. First, we employ the Schmidt decomposition to determine the entanglement properties of the optimal two-photon state to drive such a transition, and the maximum enhancement which can be achieved in comparison to the optimal classical pulse. We then adapt the optimization problem to realistic experimental constraints, where photon pairs from a down-conversion source are manipulated by local operations such as spatial light modulators. We derive optimal pulse shaping functions to enhance the absorption efficiency, and compare the maximal enhancement achievable by entanglement to the yield of optimally shaped, separable pulses.

scholarly journals Photothermally Activated Two-Photon Absorption in Ion-Implanted Silicon Quantum Dots in Silica Plates

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
C. Torres-Torres ◽  
J. Bornacelli ◽  
R. Rangel-Rojo ◽  
J. A. García-Merino ◽  
B. Can-Uc ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ultrashort Pulses ◽  
Photon Absorption ◽  
Saturable Absorption ◽  
Silicon Quantum Dots ◽  
Two Photon Absorption ◽  
Two Photon ◽  
All Optical ◽  
Potential Applications ◽  
Silicon Based

The third-order nonlinear infrared and ultraviolet properties exhibited by silicon quantum dots irradiated by ultrashort pulses were studied. The samples were prepared by 1.5 MeV Si+2ion implantation processes in high-purity silica substrates. Femtosecondz-scan measurements conducted at 830 nm wavelength revealed strong self-focusing effects together with two-photon absorption that can be switched to saturable absorption as a function of the input irradiance. Changes in the main physical mechanism responsible for the picosecond absorptive nonlinearity in the sample were also observed at 355 nm, made possible by the assistance of photothermal phenomena. Ultraviolet self-diffraction explorations allowed us to estimate the Kerr effect of the nanostructures. Potential applications for developing all-optical filtering functions performed by silicon-based nanosystems can be considered.

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