T Hesjedal and W Seidel 2003 Nanotechnology 14 91 doi:10.1088/0957-4484/14/1/320
T Hesjedal1 and W Seidel
Show affiliationsOptical lithography is the method of choice for mass production of electronic as well as acoustic devices. Cost issues, in particular, make it superior over slow but high-resolution methods, such as electron beam lithography. Also, its applicability for nonconductive substrates is an important feature for acoustic device fabrication on ceramics. In order to be able to continue the use of diffraction-limited optical lithography, new schemes have been developed that enhance the resolution. Rather complex phase-shifting masks, for instance, alter both the amplitude and the phase of the exposing light and lead to higher resolution. However, by using an elastomeric phase mask derived from a photoresist master (made by conventional photolithography), features as small as 90 nm have been demonstrated. We report on the application of the near-field phase shift technique for the fabrication of surface acoustic wave (SAW) devices. This technique is best suited for the fabrication of narrow electrode gap SAW devices that are designed for the efficient SAW excitation at higher harmonics. The combination of near-field phase shift lithography with narrow-gap SAW designs thus opens up a way for simple and low-cost SAW devices operating above 5 GHz.
42.82.Cr Fabrication techniques; lithography, pattern transfer
85.40.Hp Lithography, masks and pattern transfer
43.38.+n Transduction; acoustical devices for the generation and reproduction of sound
Soft matter, liquids and polymers
Issue 1 (January 2003)
Received 4 October 2002, in final form 24 November 2002
Published 20 December 2002
T Hesjedal and W Seidel 2003 Nanotechnology 14 91
E R Woodcock 1953 Proc. Phys. Soc. A 66 705
Miho Fujieda et al 2004 Metrologia 41 145
E Alfinito et al 1997 J. Phys. A: Math. Gen. 30 1527
M Shibahara and K Takeuchi 2009 J. Phys.: Conf. Ser. 191 012008
H Montgomery 1999 Eur. J. Phys. 20 271
A Raymond Penner 2003 Rep. Prog. Phys. 66 131
E Aurell et al 1997 J. Phys. A: Math. Gen. 30 1
L S Pan et al 2003 J. Micromech. Microeng. 13 390
H F Dowker et al 2000 Class. Quantum Grav. 17 697