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Study on Microcavity Organic Light-emitting Devices Containing Negative Refractive Index Dielectric Layer
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作者 CAI Hong-xin LI Li-xin 《Semiconductor Photonics and Technology》 CAS 2009年第3期153-157,共5页
A new structure containing negative refractive index dielectric layer(NRlDL) is introduced into microcavity. The properties of the new mierocavity organic light-emitting devices(MOLEDs) are investigated. In the ex... A new structure containing negative refractive index dielectric layer(NRlDL) is introduced into microcavity. The properties of the new mierocavity organic light-emitting devices(MOLEDs) are investigated. In the experiment, the transfer matrix method is adopted. The dependence of reflectance and transmittance on the refractive index and thickness of NRIDL are analyzed in detail. Compared with the electroluminescence spectra of non-NRIDL diodes, the line widths of the spectra of the MOLEDs are narrower and all the peaks enhance. The results show that the new structure is beneficial to improve the performance and reduce the thickness of microcavity devices. 展开更多
关键词 microcavity organic light-emitting device electroluminescence(EL) spectra negative refractive index dielectric layer
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Design of a single-mode directly modulated orbital angular momentum laser 被引量:1
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作者 Xiang Ma Shuang Zheng +3 位作者 Jia Liu Quanan Chen Qiaoyin Lu Weihua Guo 《Chinese Optics Letters》 SCIE EI CAS CSCD 2021年第8期12-17,共6页
We propose a design of single-mode orbital angular momentum(OAM) beam laser with high direct-modulation bandwidth. It is a microcylinder/microring cavity interacted with two types of second-order gratings: the complex... We propose a design of single-mode orbital angular momentum(OAM) beam laser with high direct-modulation bandwidth. It is a microcylinder/microring cavity interacted with two types of second-order gratings: the complex top grating containing the real part and the imaginary part modulations and the side grating. The side grating etched on the periphery of the microcylinder/microring cavity can select a whispering gallery mode with a specific azimuthal mode number, while the complex top grating can scatter the lasing mode with travelling-wave pattern vertically. With the cooperation of the gratings, the laser works with a single mode and emits radially polarized OAM beams. With an asymmetrical pad metal on the top of the cavity, the OAM on-chip laser can firstly be directly modulated with electrical pumping. Due to the small active volume, the laser with low threshold current is predicted to have a high direct modulation bandwidth about 29 GHz with the bias current of ten times the threshold from the simulation. The semiconductor OAM laser can be rather easily realized at different wavelengths such as the O band, C band, and L band. 展开更多
关键词 orbital angular momentum diffraction and gratings vertical emitting lasers microcavity devices semiconductor lasers single mode directly modulated laser
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