Picture of the Month – Honorable Runner-ups

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2020, September

Silicon Flower Buds
Joffrey Pernollet, CMi

These Silicon flower buds, ready to bloom, were not farmed but etched with an excessive passivation. Etching eventually made its way vertically down to reach some buried SiO2, and to slightly notch the stalks for the flowers now ready for pick-up.

2020, August

Groovy !!!
Clémentine Lipp, LMIS4

Assume the distance between neighboring circles is smaller than the under-etch of a standard Bosch process, etch and let it groove!

Simon Finn Mayer, LBM & LBEN

Glass capillary realizing that life is pain. Side view of a physically and mentally broken glass capillary imaged in CMi’s Zeiss MERLIN SEM.

LGBT’s of the nanoworld
Debdatta Ray, Cervinka Ondrej, NAM

To support the LGBT’s of the nano-world, we made TiO2 meatsurface whose features come to display the rainbow flag.

2020, July

Nicolas Maïno, LMIS4

As sun rises, light reveals a forest of elegant trees on this wafer horizon. The trees are formed from salt residues that dried up in a fractal fashion after photoresist development while the thin oxide layer gives this image its warm glow.

Plasmonic race cars
Aleksandrs Leitis, Ming-Lun Tseng, Deepthy Kavungal, Aurelian John-Herpin, BIOS

The work in academia is vibrant, stimulating and overall very exciting. Yet, it comes with the cost of potentially lower salaries than elsewhere. Therefore we cannot afford luxurious F1 sports cars. Luckily, with the deep UV lithography processes at the CMI we can fabricate millions of “Ferraris” and “McLarens” in the time scale of seconds. Here we present durable aluminum-based plasmonic F1 race cars at slightly smaller scale than their real life counterparts… Strikingly, they are not only amusing, but also highly practical for label-free biosensing applications.

Stressed micro-people
Micol Previde Massara, Hamed Sattari, Q-LAB

We were studying stress-induced buckling in poly-silicon beams after release, when we noticed that our micro-citizens are very scared of vapor HF attack. The “stress” caused all of them to break, two of them to completely lose their hair, and the one in the front to sweat out of fear as well!

Illuminati confirmed
Debdatta Ray, Cervinka Ondrej, NAM

The secret message hidden in a chromium coating over PMMA can only mean one single thing: “Illuminati confirmed!”

2020, June

Tiny tree stumps
Aleksandrs Leitis, Ming-Lun Tseng, Deepthy Kavungal, BIOS

Once again the lumberjack has visited the Merlin SEM leaving behind these nicely cut tree stumps. Interestingly, the tiny timber does not only create lucrative business, but also has exciting optical properties. The specific cut of the tree trunks allow to achieve high surface sensitivity for biomolecule detection. On top of that, these stumps are ideally suited for integration in point-of-care biochemical sensor devices.

A cheesy affair
Matthias Neuenschwander, LBNI

Eating is obviously forbidden at CMi, but someone managed to get slices of Parmesan cheese onto my wafer! Did they hold a late night pasta party in zone 15? I suspect we will never know. A silicon dioxide mask was under-etched in KOH. The mask collapsed after the wafer was dried. The holes in the oxide give it a distinctly cheesy look.

Shining encounter
Clémentine Lipp, LMIS4

Underetch of small holes walking towards each other gives rise to this beautiful optical effect.

Playtime at CMi
Samira Frey, PVLAB

For the fabrication of amorphous silicon based microchannelplates we are currently optimizing the deep reactive-ion etching with a metal mask. During the first tests some of the structures collapsed due to too much under-etching, leaving us with what looks like a game of Mikado.

Pooya Dehghan, NANOLAB

MnO2 crystals deposited on the substrate from a Manganese acetate solution using electrodeposition technique.

Broken blue bridge
Pierre Lottigier, LASPE

“We build too many walls and not enough bridges” did Sir Isaac Newton anticipate that hundreds of these bridge-like nanobeam structures could be built within hours? The problem is that some of them get broken and nobody cares… How would you repair this one? III-N blue emitting nanobeams, <300 nm thick membrane.

2020, May

Ruins of an ancient Celtic city
Luka Ćirić, LPMC

In the image one can see the cubes of KNbO3 crystals grown on SrTiO3 substrates.

Inception in SEM
Aleksandrs Leitis, Ming-Lun Tseng, BIOS

We have always dreamed of controlling the metasurface physical properties at will. By incepting the SEM, we have moved one step closed to this dream. You can see the results which were acquired with the powerful Merlin SEM in the image above. These ultra-thin metasurfaces were meant for light wavefront control and highly efficient light focusing.

Sunflower metalens
Aleksandrs Leitis, Ming-Lun Tseng, BIOS

While being in remote and rural places during the lockdown period, the BIOS lab members were inspired by the nature itself. Specifically, by sunflowers, which triggered us to fabricate metalenses with particular pattern that allow us to gather IR light with high efficiency.

Quasicrystalline “Hanami” flower
Sho Watanabe, LMGN

Do you know the Japanese traditional custom called “Hanami”? In spring, we Japanese gather together near cherry trees to enjoy their beautiful flowers, sharing some alcoholic beverages as well. Unfortunately, during the lockdown of Switzerland we needed to refrain from Hanami this year. Still, thanks to the re-opening of CMi, cherry blossom-like quasicrystalline flowers (based on Penrose P3 tiling, exhibiting five-fold rotational symmetry) made out of NiFe have been successfully fabricated via lift-off processing. As these nanostructures were cleaned with acetone and IPA, one of the important parts of Hanami, enjoying alcohol, was accomplished! And by admiring these “flowers”, you step into the Japanese culture and complete the tradition!

Swiss Cheese on a Whole Wheat Bread
Dorian Herle, Q-LAB

This healthy snack was created in the CMi cleanrooms using e-beam lithography. It shows a patterned ZEP resist on a sputtered amorphous silicon layer. Its textured surface is clearly disguisable from the smooth ZEP surface.

Pierrick Clément, LMIS1

The AFM picture shows the immobilization of single-walled carbon nanotubes (SWCNTs) between a pair of platinum electrodes on silicon substrate by dielectrophoresis. The assembly of the SWCNTs follows the applied electric field and looks very similar to electric sparks (but at the nanoscale) when an abrupt electrical discharge occurs creating a conductive channel through a normally insulating medium. This picture is dedicated to the bright sparks of the CMi! The image was recorded in CMi (Zone 15) on Bruker FastScan equipment. The device was fabricated by E-beam lithography and photolithography at the CMi.

2020, April

Chrome mask
Georges-André Racine, CMi

This picture shows colored windows in a white light transmission mode through a Cr-mask. This particular test mask for the evaluation of a high aspect ratio etch tool was the first one fabricated after the COVID-19 shutdown in the last days of April to verify functionality of the photolithographic equipment after its re-start.

Laser writer test
Georges-André Racine, CMi

Various test structures written by direct laser writing into resist to verify its performance after the CMi re-start in the last days of April.

2020, March

Fishing boat at the gate of a canal
Gözden Torun, Galatea Lab

March, the month when the nature starts to wake up, has finally arrived. I am daydreaming of a boat trip with my family along the Mediterranean coast of my country. Suddenly, my daydream becomes a true picture on my ternary tellurite glass during TEM lamella preparation. The ternary tellurite glass which is quite sensitive to heat started to melt during lamella thinning in the FIB. Image was taken in FEI Nova 600, and sample is tilted 52°. The boat actuates with the electron beam, as boat in the rough sea.

Nanopillar Sunset
Lucas Güniat, LMSC

Here we are, just you and me, admiring this beautiful sunset over the sea of Si nanopillars. This optical microscope scene was taken at the corner of a 200nm-diameter Si nanopillars array manufactured by reactive ion etching. Spin-coating a fine layer of polymer creates light interferences at the corner of the array, giving this bright intense orange color. The stars in the sky are nothing more than impurities in the polymer layer. It’s getting dark now… are we gonna start the campfire?

2020, February

The Kubrick Crystal
Didem Dede, LMSC

Symmetry has always been the basis of beauty. In this image, you see the selective area epitaxial growth of InAs/GaAs crystal. Due to the growth environment, we observe this overgrown structure.

Mirror, mirror
Clémentine Lipp, LMIS4

Mirror, mirror on the wall, who’s the fairest of them all?

Platinum walls
Sadegh Kamaei Bahmaei, NANOLAB

Monolayer of graphene on top of the platinum electrode at a slow SEM image scan. Even the micro-world is scared of Corona and it tries to build a lot of walls to protect itself from the virus.

2020, January

Modern Architecture Micro-Dome
Amir Youssefi, LPQM

This suspended micro-dome is actually a high-Q trampoline mechanically compliant superconducting parallel plate capacitor used in quantum electro-mechanical systems.

Nano-foldable Keyboard
Hamed Sattari, Alain Yuji Takabayashi, Q-LAB

We passivate our photonic chips by an alumina layer deposition to protect the stack from HF vapor attack. Here, the passivation was not perfect, and consequently, the HF attack peeled of a filler structure layer, which looks like a foldable keyboard.

Starry Nano-light
Ming Lun Tseng, BIOS

From GNN’s Ming Lun Tseng in Lausanne: The long-lost, Vincent van Gogh’s last painting “Starry Nano-Light” is finally found, in the CMi clean room, EPFL, Lausanne. It is believed that an anonymous collector hided it in this world-class facility to prevent its damage from brutal people during the lab cleanup activity. Different from Vincent van Gogh’s other works, this painting was made by performing reactive ion etching on a 380-um thick, high quality double side polished, 4 inch silicon wafers for 1 hour 4 minute 30 seconds to create a nanostructure on the top, which scatters light into the sky. Now this art work will be sent to Landesmuseum for a further evaluation of its value.

Sinister cave
Kaitlin Howell, Marco Liffredo, Jialiang Fan, NEMS

While searching with Indiana Jones for the Sankara stones, we stumbled upon a sinister cave, full of traps and unlucky trespassers. Stalagmites and stalactites made venturing inside dangerous. The cave was creating during the release of Si3N4 beams with AlN/Pt electrodes through Bosch and isotropic Si etching, which left residues on the surfaces. Further KOH etching produced the pyramid structures along the bottom of the cave.

Lucas Güniat, LMSC

You guys should really be more careful while cleaning! I even found a Si nanopillar mouse on my chip! And on top of that with GaAs nanowire arms grown by Molecular Beam Epitaxy! Am I authorized to borrow the Nano-cat from Clementine Lipp (see June 2017 images below) to hunt it?

Micol Previde Massara, Q-LAB

After oxide sputtering and etching, micro-volcano structures formed on the wafer.

Turtle diving into ocean
Kevin Keim, Gloria Porro, CLSE

In January 2020 this titanium-platinum turtle is diving from the sharp edge of a new teardrop-shaped 3D electrode into the ocean, discovering new shores. “Bye, bye CMi. Thanks for the great time. I will send you a postcard.”

Germanium hills and valleys
Nicolas Humblot, LMSC

The recent snowfalls have evenly covered the mountain tops in Germanium ski resort. The snow/rain limit is worryingly rising as temperature does. Germanium film was grown by sputtering on top of a Silicon substrate. The image was obtained with AFM in Z15, FastScanA tip, ScanAsyst in Air mode.