This paper presents an innovative device for self-parking in a v-groove and a self-latching vertical mirror on the suspension diaphragm using the out of plane fiber-optical switch array technique. The self-parking offers integrating the optical fiber and mirror within the same optical switch. The self-latching vertical mirror is supported on the suspension diaphragm by four cantilever beams. The theoretical analysis includes a dynamic simulation using the ANSYS software and corner compensation using the IntelliCAD software. The fabrication process consists of wet etching mircromachining, lithography, and excimer laser ablation. This proposed process is simpler than those proposed in other works. An electrostatic driving voltage is used to operate the optical switch. The mirror is made of a photoresist coating with gold film as the switching element. The reflectivity of the gold film mirror is higher than 85% using a wavelength of 1310nm. The micro-optical switch has a maximum of displacement of 48 micrometers and the switching time is below 0.4 ms with a driving voltage of 100 VDC.
The electromagnetic optical switch combines with Ni/Fe permalloy magnetic circuit design, high aspect ratio microstructure electroplating, bulk micromachining, excimer laser ablation and low temperature wafer bonding. The result shows it can output force 68 mN, deflection angle can reach 82 degree(s) only with 4820A/m, frequency can reach 2 kHz, and bonding strength can be larger than 216 kg/cm2.
The paper presents novel concepts of batch fabrication of micro-ball lens array technology integrated on the silicon based wafer by low temperature wafer bonding by which can improve appropriate distance of optical fiber coupling. The silicon based coupling platform consists of the self-parking framework, micro-ball lens array, and precision platform for optical fiber coupling purpose. The structure of optical platform is able to improve distance of between fiber and micro-ball lens and increase coupling efficiency. The micro- ball lens array is batch fabricated by polymeric material and melting photoresist through low temperature wafer bonding. Then batch assembly onto each other flat-topped mesa that adjoins to the v-groove. The corner compensation offers a method to fabricate self-parking framework and flat-topped mesa in the intersection of two v-grooves. This fabrication process not only provides accurate coupling distance between fibers and micro-ball lens but also reduces micro-assembly cost.
This paper presents a novel approach for bonding technique based on the concept of patternable and low temperature process. This method especially is suitable for the design of microstructure by surface micromachining. By this way, the bonding can be solved. The patternable intermediate of photoresist is applied to conduct wafer-bonding experiment. SU-8 is selected as intermediate layer the thickness of SU-8 not only can be easily controlled, but also can be patterned into any-shape by the technique. Furthermore, this method provides smooth intermediate pad to contact for bonding. The experiment of wafer-to-wafer intermediate bonding was conducted. The preliminary results show that the influences of high temperature, electric field, and void can be avoided. The tensile stress test is shown the bonding strength up to 216 kg/cm2 can be reached.
The paper presents an innovative concept of self-parking ideal in v-groove and self-latching vertical mirror on the suspension diaphragm with technique out of plane fiber-optical switch arrays was fabricated. The self-parking ideal offers an integration by which the distance between optical fiber and mirror can be minimizes. The self-latching vertical mirror located on the suspension diaphragm that is supported by four cantilever beams. At first, it is achieved by bulk micromachining and is ablated by mask projection of 248 nm excimer laser. The vertical mirror structure was fabricated by thick photoresist as SU-8 through UV lithography and then sputters gold films. The fiber-optical switch solves in plane micro-optical that require large moving space, microassembly problem of fiber to mirror distance and reducing the roughness of mirror surface. In the experiment, out of plane micro-optical switch are successfully achieved by above key process. By the measurement of roughness of mirror must be less than 20 nm rms. The reflectivity of the gold films mirror by a wavelength of 1310 nm is higher than 85%. The micro-optical switch has maximum displacement 48 micrometers and switching time is below 0.4 ms with driving voltage 100 V DC.
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