Difference frequency generation in CdSe quantum dots

IF 2 3区物理与天体物理 Q3 OPTICS Applied Physics B Pub Date : 2025-04-21 DOI:10.1007/s00340-025-08462-7

Komal Jain, Deepti Maikhuri, Anshuman Sahai

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Abstract

We have investigated the second-order nonlinear susceptibility associated with difference frequency generation in singly electron charged CdSe/ZnS, CdSe/ZnSe, CdSe/MgS & CdSe/MgSe quantum dots via intersublevel transitions in the conduction band. The confined energy levels in the dots are calculated in the effective-mass approximation by solving the three-dimensional Schrodinger equation. The second-order nonlinear susceptibility coefficients in the conduction band DFG processes are then determined using density matrix approach. As the dot radius increases, the DFG susceptibility spectrum shifts towards lower energy side. Also, we observe that, the peak height of the DFG spectrum increases slightly with increasing dot radius. For CdSe/ZnS, CdSe/ZnSe, CdSe/MgS quantum dots the second order nonlinear susceptibility associated with DFG is found to be one order higher (≈10⁻¹⁰ m/V) in contrast to that of the bulk CdSe (≈10⁻¹¹ m/V). We observed that second-order nonlinear difference frequency generation processes depend on the polarization state of incident photon beam, dot size and the surrounding matrix.

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CdSe量子点的差频产生

我们研究了单电子带电CdSe/ZnS、CdSe/ZnSe、CdSe/MgS和amp中与差频产生相关的二阶非线性磁化率；CdSe/MgSe量子点在传导带的亚能级间跃迁。通过求解三维薛定谔方程，在有效质量近似中计算了点中的受限能级。然后用密度矩阵法确定导带DFG过程的二阶非线性磁化系数。随着点半径的增大，DFG的磁化谱向低能量侧偏移。同时，我们观察到DFG光谱的峰高随着网点半径的增加而略有增加。对于CdSe/ZnS， CdSe/ZnSe， CdSe/MgS量子点，与DFG相关的二阶非线性磁化率（≈10−10 m/V）比块体CdSe（≈10−11 m/V）高一个数量级（≈10−10 m/V）。我们观察到二阶非线性差频产生过程依赖于入射光子束的偏振态、点大小和周围矩阵。

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来源期刊

Applied Physics B 物理-光学

CiteScore

4.00

自引率

4.80%

发文量

202

审稿时长

3.0 months

期刊介绍： Features publication of experimental and theoretical investigations in applied physics Offers invited reviews in addition to regular papers Coverage includes laser physics, linear and nonlinear optics, ultrafast phenomena, photonic devices, optical and laser materials, quantum optics, laser spectroscopy of atoms, molecules and clusters, and more 94% of authors who answered a survey reported that they would definitely publish or probably publish in the journal again Publishing essential research results in two of the most important areas of applied physics, both Applied Physics sections figure among the top most cited journals in this field. In addition to regular papers Applied Physics B: Lasers and Optics features invited reviews. Fields of topical interest are covered by feature issues. The journal also includes a rapid communication section for the speedy publication of important and particularly interesting results.