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Wearable Ubiquitous Technol."],"published-print":{"date-parts":[[2018,1,8]]},"abstract":"<jats:p>In this paper, we present an approach to realize the levitation of a small object with an embedded electronic circuit. Luciola is a light-emitting particle with a diameter of 3.5mm and a weight of 16.2mg moving in mid-air in a 10.4cm x 10.4cm x 5.4cm space through acoustic levitation using two 40-kHz 17 x 17 ultrasonic transducer arrays placed face-to-face at a distance of 20cm and wirelessly powered by 12.3-MHz resonant inductive coupling. The novelty of this paper is the acoustically levitated electronic object by the combined application of ultrasonic levitation and wireless powering to the levitated electronic object. A new shape of the levitated object and a new placement of the receiver coil to simultaneously realize acoustic levitation and wireless powering are proposed, achieving a stable wireless powering to a rotating levitated object at the bottom of an acoustic potential. To enable the levitation of a particle, a custom IC chip is essential in reducing the size and weight of the particle. In the design of the custom IC chip, a new voltage detector circuit enabling an accurate voltage detection and a correct output during the start-up is proposed to achieve an intermittent lighting of the LED to increase the maximum distance between the transmitter and the receiver coil. Luciola is applied to a self-luminous pixel in a mid-air display and drawings of characters in mid-air are demonstrated.<\/jats:p>","DOI":"10.1145\/3161182","type":"journal-article","created":{"date-parts":[[2018,1,9]],"date-time":"2018-01-09T13:26:11Z","timestamp":1515504371000},"page":"1-17","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":20,"title":["Luciola"],"prefix":"10.1145","volume":"1","author":[{"given":"Yuki","family":"Uno","sequence":"first","affiliation":[{"name":"The University of Tokyo"}]},{"given":"Hao","family":"Qiu","sequence":"additional","affiliation":[{"name":"The University of Tokyo"}]},{"given":"Toru","family":"Sai","sequence":"additional","affiliation":[{"name":"The University of Tokyo"}]},{"given":"Shunta","family":"Iguchi","sequence":"additional","affiliation":[{"name":"The University of Tokyo"}]},{"given":"Yota","family":"Mizutani","sequence":"additional","affiliation":[{"name":"The University of Tokyo"}]},{"given":"Takayuki","family":"Hoshi","sequence":"additional","affiliation":[{"name":"The University of Tokyo"}]},{"given":"Yoshihiro","family":"Kawahara","sequence":"additional","affiliation":[{"name":"The University of Tokyo"}]},{"given":"Yasuaki","family":"Kakehi","sequence":"additional","affiliation":[{"name":"Keio University"}]},{"given":"Makoto","family":"Takamiya","sequence":"additional","affiliation":[{"name":"The University of Tokyo"}]}],"member":"320","published-online":{"date-parts":[[2018,1,8]]},"reference":[{"key":"e_1_2_2_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/2047196.2047239"},{"key":"e_1_2_2_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/2984751.2985699"},{"key":"e_1_2_2_3_1","doi-asserted-by":"publisher","DOI":"10.1145\/2850414"},{"key":"e_1_2_2_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/2601097.2601118"},{"key":"e_1_2_2_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/0041-624X(75)90072-4"},{"key":"e_1_2_2_6_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1301860110"},{"key":"e_1_2_2_7_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.2396893"},{"key":"e_1_2_2_8_1","doi-asserted-by":"publisher","DOI":"10.1143\/JJAP.46.4948"},{"key":"e_1_2_2_9_1","doi-asserted-by":"publisher","DOI":"10.1109\/TOH.2010.4"},{"key":"e_1_2_2_10_1","unstructured":"Ultrahaptics. Retrieved from https:\/\/www.ultrahaptics.com\/  Ultrahaptics. Retrieved from https:\/\/www.ultrahaptics.com\/"},{"key":"e_1_2_2_11_1","doi-asserted-by":"publisher","DOI":"10.7567\/JJAP.53.07KE07"},{"key":"e_1_2_2_12_1","doi-asserted-by":"publisher","DOI":"10.1145\/2663806.2663850"},{"key":"e_1_2_2_13_1","doi-asserted-by":"crossref","unstructured":"Marzo A. Seah S. A. Drinkwater B. W. Sahoo D. R. Long B. and Subramanian S. 2015. Holographic acoustic elements for manipulation of levitated objects. Nature Communications 6 (October 2015) 8661:1--8661:7. DOI: http:\/\/dx.doi.org\/10.1038\/ncomms9661  Marzo A. Seah S. A. Drinkwater B. W. Sahoo D. R. Long B. and Subramanian S. 2015. Holographic acoustic elements for manipulation of levitated objects. Nature Communications 6 (October 2015) 8661:1--8661:7. 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