Journal
OPTICS EXPRESS
Volume 25, Issue 24, Pages 30105-30114Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.030105
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Funding
- National Council for the Improvement of Higher Education (CAPES)
- State of Sao Paulo Research Foundation (FAPESP) [2013/20180-3, 2015/04113-0, 08/57857-2]
- National Council for Scientific and Technological Development (CNPq) [446746/2014-2, 574017/2008-9]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [08/57857-2] Funding Source: FAPESP
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Phased arrays are expected to play a critical role in visible and infrared wireless systems. Their improved performance compared to single element antennas finds uses in communications, imaging, and sensing. However, fabrication of photonic antennas and their feeding network require long element separation, leading to the appearance of secondary radiation lobes and, consequently, crosstalk and interference. In this work, we experimentally show that by arranging the elements according to the Fermat's spiral, the side lobe level (SLL) can be reduced. This reduction is proved in a CMOS-compatible 8-element array, revealing a SLL decrement of 0.9 dB. Arrays with larger numbers of elements and inter-element spacing are demonstrated through a spatial light modulator (SLM) and an SLL drop of 6.9 dB is measured for a 64-element array. The reduced SLL, consequently, makes the proposed approach a promising candidate for applications in which antenna gain, power loss, or information security are key requirements. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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