Excitation dependences of gain and carrier-induced refractive index change in quantum-dot lasers

2007 ◽  
Vol 90 (5) ◽  
pp. 051112 ◽  
Author(s):  
M. Lorke ◽  
F. Jahnke ◽  
W. W. Chow
Keyword(s):  
Refractive Index ◽  
Quantum Dot ◽  
Refractive Index Change ◽  
Quantum Dot Lasers ◽  
Index Change

Photoionization cross section and refractive-index change of hydrogenic impurities in a CdS-SiO2 spherical quantum dot

Open Physics ◽  
2010 ◽  
Vol 8 (3) ◽  
Author(s):  
Sait Yılmaz ◽  
Haluk Şafak ◽  
Recep Şahingoz ◽  
Mustafa Erol
Keyword(s):  
Refractive Index ◽  
Quantum Dot ◽  
Cross Section ◽  
Refractive Index Change ◽  
Photoionization Cross Section ◽  
Optical Intensity ◽  
Hydrogenic Impurity ◽  
Index Change ◽  
Energy Eigenvalues ◽  
Spherical Quantum Dot

AbstractIn this study, we calculate the photoionization cross section and refractive-index change of an on-center hydrogenic impurity in a CdS-SiO2 spherical quantum dot. In numerical calculations, both the finite- and infinite-confinement cases are considered and a variational scheme is adopted to determine the energy eigenvalues for the impurity. The variations of the photoionization cross section with the dot radius, the refractive-index change, and the normalized photon energy are investigated, and the effect of the potential-barrier height on the cross section is discussed. The results obtained show that the photoionization cross section and the refractive-index change in CdS-SiO2 spherical quantum dots are sensitively dependent on the incident optical intensity and on the dot sizes.

scholarly journals Theoretical study of polarization dependence of carrier-induced refractive index change of quantum dot

2018 ◽  
Vol 26 (3) ◽  
pp. 2252
Author(s):  
Qingyuan Miao ◽  
Ziyi Yang ◽  
Jianji Dong ◽  
Ping-An He ◽  
Dexiu Huang
Keyword(s):  
Refractive Index ◽  
Quantum Dot ◽  
Theoretical Study ◽  
Refractive Index Change ◽  
Polarization Dependence ◽  
Index Change

scholarly journals Critical angle reflection imaging for quantification of molecular interactions on glass surface

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guangzhong Ma ◽  
Runli Liang ◽  
Zijian Wan ◽  
Shaopeng Wang
Keyword(s):  
Refractive Index ◽  
Small Molecule ◽  
Molecular Interactions ◽  
Glass Surface ◽  
Critical Angle ◽  
Dynamic Range ◽  
Refractive Index Change ◽  
Label Free ◽  
Index Change ◽  
Sensing Range

AbstractQuantification of molecular interactions on a surface is typically achieved via label-free techniques such as surface plasmon resonance (SPR). The sensitivity of SPR originates from the characteristic that the SPR angle is sensitive to the surface refractive index change. Analogously, in another interfacial optical phenomenon, total internal reflection, the critical angle is also refractive index dependent. Therefore, surface refractive index change can also be quantified by measuring the reflectivity near the critical angle. Based on this concept, we develop a method called critical angle reflection (CAR) imaging to quantify molecular interactions on glass surface. CAR imaging can be performed on SPR imaging setups. Through a side-by-side comparison, we show that CAR is capable of most molecular interaction measurements that SPR performs, including proteins, nucleic acids and cell-based detections. In addition, we show that CAR can detect small molecule bindings and intracellular signals beyond SPR sensing range. CAR exhibits several distinct characteristics, including tunable sensitivity and dynamic range, deeper vertical sensing range, fluorescence compatibility, broader wavelength and polarization of light selection, and glass surface chemistry. We anticipate CAR can expand SPR′s capability in small molecule detection, whole cell-based detection, simultaneous fluorescence imaging, and broader conjugation chemistry.

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