scholarly journals All-dielectric unidirectional complementary media for transmission enhancement

2020 ◽  
Vol 28 (22) ◽  
pp. 33263
Author(s):  
Min Huang ◽  
Xun Li ◽  
Jie Luo
Keyword(s):  
Transmission Enhancement

scholarly journals Tunable Fluid-Type Metasurface for Wide-Angle and Multifrequency Water-Air Acoustic Transmission

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Zhandong Huang ◽  
Shengdong Zhao ◽  
Yiyuan Zhang ◽  
Zheren Cai ◽  
Zheng Li ◽  
...  
Keyword(s):  
Incident Angle ◽  
Acoustic Energy ◽  
Wide Angle ◽  
Acoustic Metamaterials ◽  
Fluid Type ◽  
Acoustic Transmission ◽  
Interface Instability ◽  
Practical Applications ◽  
Air Interface ◽  
Transmission Enhancement

Efficient acoustic communication across the water-air interface remains a great challenge owing to the extreme acoustic impedance mismatch. Few present acoustic metamaterials can be constructed on the free air-water interface for enhancing the acoustic transmission because of the interface instability. Previous strategies overcoming this difficulty were limited in practical usage, as well as the wide-angle and multifrequency acoustic transmission. Here, we report a simple and practical way to obtain the wide-angle and multifrequency water-air acoustic transmission with a tunable fluid-type acoustic metasurface (FAM). The FAM has a transmission enhancement of acoustic energy over 200 times, with a thickness less than the wavelength in water by three orders of magnitude. The FAM can work at an almost arbitrary water-to-air incident angle, and the operating frequencies can be flexibly adjusted. Multifrequency transmissions can be obtained with multilayer FAMs. In experiments, the FAM is demonstrated to be stable enough for practical applications and has the transmission enhancement of over 20 dB for wide frequencies. The transmission enhancement of music signal across the water-air interface was performed to demonstrate the applications in acoustic communications. The FAM will benefit various applications in hydroacoustics and oceanography.

scholarly journals Smith-Purcell radiation based on the transmission enhancement of a subwavelength hole array with inner tunnels

2021 ◽  
Vol 29 (5) ◽  
pp. 7767
Author(s):  
Ping Zhang ◽  
Deqiang Zhao ◽  
Xiaosong Wang ◽  
Shaomeng Wang ◽  
Yusuke Sakai ◽  
...  
Keyword(s):  
Hole Array ◽  
Transmission Enhancement

Transmission enhancement through a metallic slit assisted by low scattering loss corrugations

2008 ◽  
Vol 281 (10) ◽  
pp. 2996-2999 ◽  
Author(s):  
C.M. Wang ◽  
C.C. Chao ◽  
H.I. Huang ◽  
B. Ung ◽  
Y. Sheng ◽  
...  
Keyword(s):  
Scattering Loss ◽  
Transmission Enhancement ◽  
Metallic Slit

Characteristics of Near-infrared Induced Transmission Enhancement of Thin Film Micro-structures

2019 ◽  
Vol 48 (7) ◽  
pp. 731001
Author(s):  
葛少博 GE Shao-bo ◽  
刘卫国 LIU Wei-guo ◽  
周顺 ZHOU Shun ◽  
杨鹏飞 YANG Peng-fei ◽  
李世杰 LI Shi-jie ◽  
...  
Keyword(s):  
Thin Film ◽  
Near Infrared ◽  
Transmission Enhancement ◽  
Micro Structures

Speech and Audio Signal Applications

2005 ◽  
pp. 2592-2596
Author(s):  
Hector Perez-Meana ◽  
Mariko Nakano-Miyatake
Keyword(s):  
Signal Processing ◽  
Audio Signal ◽  
Audio Signals ◽  
Vlsi Technology ◽  
Transmission Enhancement

With the development of the VLSI technology the performance of signal processing devices have greatly improved making possible the implementation of more efficient systems to storage, transmission enhancement and reproduction of speech and audio signals. Some of these successful applications are shown in Table 1.

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