Charging Surface. Paul Worgan, Michael Collett, Themis Omirou, Matt Sutton, 2016. 1605920.6 filed April 7, 2016. Patent Pending.

Alex Harman, Hristo Dimitrov, Ruisha Ma, Sam Whitehouse, Yiu Li, Paul Worgan, Themis Omirou, and Anne Roudaut. 2016. NotiFall: Ambient Sonification System Using Water. In Proceedings of the 2016 CHI Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA '16). ACM, New York, NY, USA, 2667-2672. DOI:

NotiFall is an experimental prototype of an ambient auditory notification system. It uses the sound of falling water to subtly notify users for non-urgent matters, such as weather alerts or emails in an unobtrusive manner. These sounds are controlled and altered in order to convey a wider range of auditory cues and information. Traditionally, ambient notification systems are application specific and are limited in the way they can transmit information. In comparison, NotiFall is easily programmable, suitable for a wide range of home and work environments, and makes use of both visual and audio cues in order to impart information.

Christos Chacholiades, Cesar Flores Cano, Yuying Wang, Eman Meldah, Themis Omirou, and Anne Roudaut. 2016. IStage: An Interactive Stage System. In Proceedings of the 2016 CHI Conference Extended Abstracts on Human Factors in Computing Systems (CHI EA '16). ACM, New York, NY, USA, 2661-2666. DOI:

​​At present, performers need a technical team of experts to control lights, on-stage displays, and to actuate multiple devices simultaneously. All these activities have to be arranged in a complex choreography in order to allow the audience to experience the illusion of the interaction between these devices and the performer’s movements. IStage is an interactive system that allows controlling the on-stage equipment through the use of body movements and gestures. The aim is to enhance the performance on-stage and at the same time to enrich the audience’s overall engagement with the show. The project contributes by presenting a generic toolkit for artists; to enable interactive performances, as well as that it is cost-effective, easy-to-use, and easy-to-install. The initial prototype involves a Microsoft Kinect 2 used as the primary sensing device to track the body gestures, in combination with a sound impact sensor. IStage uses a set of output devices: a projector, led strips, a bubble machine and audio. Lastly, we also present the results of a formative study.

Deepak Sahoo, Takuto Nakamura, Asier Marzo, Themis Omirou, Michihiro Asakawa, Sriram Subramanian, JOLED: A mid-air display based on electrostatic rotation of levitated Janus objects, UIST 2016, Japan, to appear 2016.​

JOLED is a midair display for interactive physical visualization using Janus objects as physical voxels. The Janus objects have special surfaces that have two or more distinct physical properties. In JOLED, they are levitated in midair and controllably rotated to reveal their different physical properties. We made the voxels by coating the faces of expanded polystyrene beads with different materials, and applied a thin patch of titanium dioxide to induce electrostatic charge in them. Transparent indium tin oxide electrodes are used around the levitation volume to create a tailored electric field to control the orientation of the voxels. We propose a novel method to control the angular position of individual objects in a grid using electrostatic rotation and their 3D position using acoustic levitation. We present a display in which voxels can be flipped independently, as well as two midair physical games with a voxel as the playable character that moves in 3D across other physical structures and rotates to reflect its status in the games. We demonstrate a voxel update speed of 37.8 ms/flip, which is video-rate.

Paul Worgan, Odysseas Pappas, Themis Omirou and Michael Collett, Flexible on-body coils for inductive power transfer to IoT garments and wearables, Internet of Things (WF-IoT), 2015 IEEE 2nd World Forum on, Milan, 2015, pp. 297-298.

​Inductive power transfer is a promising technology for ambient charging and powering of wearable devices without the need for direct user intervention. Existing systems typically use circular or rectangular coils built using inflexible wire and fixed into a rigid shape. This paper explores the design of receiver coils for wearable inductive power transfer. Our study demonstrates receive coil designs that visually embody patterns or logos do not significantly reduce receive voltage compared to a traditional wire loop of the same number of turns, giving designers flexibility over the appearance of wearable power transfer coils.

Themis Omirou, Asier Marzo, Sue Ann Seah, and Sriram Subramanian. 2015. LeviPath: Modular Acoustic Levitation for 3D Path Visualisations. In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems (CHI '15). ACM, New York, NY, USA, 309-312. 

​LeviPath is a modular system to levitate objects across 3D paths. It consists of two opposed arrays of transducers that create a standing wave capable of suspending objects in mid-air. To control the standing wave, the system employs a novel algorithm based on combining basic patterns of movement. Our approach allows the control of multiple beads simultaneously along different 3D paths. Due to the patterns and the use of only two opposed arrays, the system is modular and can scale its interaction space by joining several LeviPaths. In this paper, we describe the hardware architecture, the basic patterns of movement and how to combine them to produce 3D path visualisations.

Themis Omirou, Asier Marzo Perez, Sriram Subramanian, Anne Roudaut, Floating Charts: Data Plotting using Free-Floating Acoustically Levitated Representations. In Proceedings of 3D User Interfaces Conference (3DUI'16). IEEE, South Carolina, USA. DOI: ​10.1109/3DUI.2016.7460051.

Floating Charts is a modular display that utilises acoustic levitation for positioning free-floating objects. Multiple objects are individually levitated to compose a dynamic floating chart with the ability to move in real time to reflect changes in data. Floating objects can have different sizes and colours to represent extra information.

Themis Omirou