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VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260914T033508Z
LAST-MODIFIED:20141007T152412Z
DTSTART:20141107T150000Z
DTEND:20141107T160000Z
UID:event1344@bu.edu
URL:http://physics.bu.edu/internal/events/show/1344
SUMMARY:Electrothermally Actuated Steering Micromirror with Integrated Vari
	focal Capability
DESCRIPTION:Featuring Jessica Morrison\n\nPart of the Preliminary Oral Exam
	.\n\nExamining Committee: David Bishop\, David Campbell\, John Butler\, and
	 Thomas Little (ECE)\n\n![Morrison](/resources/event-image/1344/f13f241_sma
	ll)\n\n![Morrison](/resources/event-image/1344/faf2dce_small)\n\nAbstract:\
	nMicro-opto-electromechanical systems (MOEMS) are used for beam deflection 
	and shaping in a wide range of applications. They are utilized as range fin
	ders\, in optical coherence tomography\, in optical cross connects\, in pro
	jection systems and in adaptive optics. Commercially available deformable m
	irrors\, which employ MEMS as their backbone\, are now a common method of r
	educing astigmatisms and other aberrations to improve image resolution. A c
	ombination of macroscopic adaptive optics and a scanning micromirror was us
	ed to increase the signal to noise ratio in an optical wireless communicati
	ons (OWC) setup\, demonstrating the use of steerable micro-optics as a mech
	anism to increase speed and bandwidth in communications. \n\nWe demonstrate
	 a novel micromirror design in which both beam steering and variable focus 
	are integrated into one device. Our design is an electrothermally actuated 
	gold on polysilicon micromirror. The natural parabolic shape of a thermal b
	imorph structure can be utilized to provide nearly aberration free imaging.
	 The 400 µm diameter mirror has a minimum focal length of hundreds of micr
	ons which can be tuned continuously between concave to a focal length of +2
	5 mm\, convex in shape. In addition\, the mirror is capable of up to ±30°
	 beam deflection along both x- and y- axes. Such capacity can be used as a 
	tool for color mixing in solid state lighting (SSL)\, to improve the signal
	 to noise ratio in OWC with SSL\, or in beam shaping such as generating sup
	er-Gaussian light needles and other non-divergent\, tightly focused beams. 
	The integration of a large range varifocal membrane and steering actuators 
	has tremendous implications in both optical systems in research and innovat
	ive lighting products. The design simplifies what would typically be a syst
	em of multiple optical components into a single device\, therefore reducing
	 both cost and complexity.
LOCATION:PRB 365\, 3 Cummington Mall\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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