Large refractive index change induced by ion implantation in lithium niobate

1974 ◽  
Vol 25 (6) ◽  
pp. 329-331 ◽  
Author(s):  
David T. Y. Wei ◽  
William W. Lee ◽  
Louis R. Bloom
Keyword(s):  
Refractive Index ◽  
Lithium Niobate ◽  
Ion Implantation ◽  
Refractive Index Change ◽  
Index Change

Refractive index change in lithium niobate induced by focused femtosecond laser

2004 ◽  
Author(s):  
Li Gui ◽  
Baoxi Xu ◽  
Dongjiang Wu ◽  
Yeow W. Goh ◽  
Tow C. Chong
Keyword(s):  
Refractive Index ◽  
Lithium Niobate ◽  
Femtosecond Laser ◽  
Refractive Index Change ◽  
Index Change

scholarly journals Thin-Film Lithium Niobate Based Acousto-Optic Modulation Working at Higher-Order TE1 Mode

Photonics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 12
Author(s):  
Yang Yang ◽  
Yin Xu ◽  
Dongmei Huang ◽  
Feng Li ◽  
Yue Dong ◽  
...  
Keyword(s):  
Thin Film ◽  
Refractive Index ◽  
Lithium Niobate ◽  
Optical Waveguide ◽  
Mode Conversion ◽  
Refractive Index Change ◽  
Acoustic Resonator ◽  
Higher Order ◽  
Index Change ◽  
On Chip

Acousto-optic modulation (AOM) is regarded as an effective way to link multi-physical fields on-chip. We propose an on-chip AOM scheme based on the thin-film lithium niobate (TFLN) platform working at the higher-order TE1 mode, rather than the commonly used fundamental TE0 mode. Multi-physical field coupling analyses were carried out to obtain the refractive index change of the optical waveguide (>6.5×10−10 for a single phonon) induced by the enhanced acousto-optic interaction between the acoustic resonator mode and the multimode optical waveguide. By using a Mach-Zehnder interferometer (MZI) structure, the refractive index change is utilized to modulate the output spectrum of the MZI, thus achieving the AOM function. In the proposed AOM scheme, efficient mode conversion between the TE0 and TE1 mode is required in order to ensure that the AOM works at the higher-order TE1 mode in the MZI structure. Our results show that the half-wave-voltage-length product (VπL) is <0.01 V·cm, which is lower than that in some previous reports on AOM and electro-optic modulation (EOM) working at the fundamental TE0 mode (e.g., VπL > 0.04 V·cm for AOM, VπL > 1 V·cm for EOM). Finally, the proposed AOM has lower loss when compared with EOM because the electrode of the AOM can be placed far from the optical waveguide.

Slow Light Investigation on Power Consumption of Lithium Niobate Phc Switch Based on Linear Electro-Optic Effect

2020 ◽  
Vol 41 (2) ◽  
pp. 145-151 ◽  
Author(s):  
Zaineb Gharsallah ◽  
Monia Najjar ◽  
Vijay Janyani
Keyword(s):  
Refractive Index ◽  
Lithium Niobate ◽  
Applied Voltage ◽  
Slow Light ◽  
Optical Switch ◽  
Extinction Ratio ◽  
Refractive Index Change ◽  
Defect Mode ◽  
Index Change ◽  
Electro Optic

AbstractIn this work, an optical switch based on electro-optic effect is reported. We used defect mode in two-dimensional photonic crystal made of Lithium Niobate. Under an applied voltage of 3 V, a refractive index change of −0.0702 is obtained which has led to a transmittance contrast about 60% for the ON state and a high extinction ratio of about 20 dB. Moreover, Slow light structure performance is investigated to optimize proposed optic switch. Due to elliptic shape of holes, the applied voltage is decreased to 0.5 V. Also, a refractive index change decrease around −0.0481, a transmittance contrast increase 65 %, and an extinction ratio increase by 5 dB have been observed. We used plan wave expansion and finite difference time domain methods to analyze the structures performances. It is seen that a defect mode shift about 40 nm and a switching length of 6.48 μm are obtained with drive voltage of 3 V for simple structure and only 0.5 V for slow light structure.

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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